When we look at rings on a tree, what are we really looking at layers of crushed primary phloem xylem with alternating thick and thin walls.
The age of the tree and the climatic conditions during each year of its life can both be determined from these rings. In contrast to the dark rings, which symbolize wood that developed in the late summer and fall, the light rings represent wood that grew in the spring and early summer.
Xylem and phloem, the two main transport systems in plants, make up vascular tissue. Vascular bundles spanning roots, stems, and leaves contain them in all plant organs. Water and dissolved ions are moved up the plant by the xylem, which originates at the roots. The growing roots, leaves, and fruits serve as "sinks" for the metabolites that are transported by phloem from the "sources" of production.
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which of the following is found in gram-positive cell envelopes? group of answer choices lipopolysaccharides outer membrane porins techoic acids
Teichoic acids are found in gram-positive cell envelopes. Option D is correct.
Gram-positive bacteria have a thick peptidoglycan layer in their cell wall, which is anchored to the cell membrane by teichoic acids. Teichoic acids are polymers of glycerol or ribitol and are covalently linked to the peptidoglycan layer. They play a role in maintaining the structure and stability of the cell wall and may also be involved in adhesion to host cells and biofilm formation.
Lipopolysaccharides and outer membrane porins are found in gram-negative bacteria, which have a more complex cell envelope with an outer membrane in addition to the peptidoglycan layer and cell membrane. The outer membrane contains lipopolysaccharides and porins, which play important roles in protecting the cell from environmental stresses and interacting with the host immune system.
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--The given question is incomplete, the complete question is
"Which of the following is found in gram-positive cell envelopes? group of answer choices A) lipopolysaccharides B) outer membrane C) porins D) Teichoic acids"--
what did hershey and chase prove was the hereditary material?
Hershey and Chase proved that DNA was the hereditary material. Through their experiments, they were able to demonstrate that the genetic material of a virus is composed of DNA and not protein.
They were able to locate the viral particles using radioactive isotopes of sulphur and phosphorus, and they discovered that the phosphorus was in the virus's nucleic acid and the sulphur was in its protein.
By doing this, they were able to demonstrate that the virus' genetic material was made up of DNA rather than protein. To confirm the veracity of their findings, they also ran a control experiment. They utilised two separate viral strains, one tagged with sulphur and the other with phosphorus.
They were able to demonstrate that DNA was the hereditary material by comparing the findings and finding that only the virus with the tagged phosphorus was transmitted to the following generation.
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Explain the process of fertilisation in human beings?
Fertilization is the fusion of the male and female gametes, or sperm and ovum which leads to and ovulation .During the intercourse,the sperm enters the fallopian tube, passes through the zona pellucida layer of the ovum (female egg), and combines with it to create the zygote (fertilized egg).
The process of fertilisation occurs in the following stages:
1. Sperm Capacitation- As the name suggests, is the process of getting sperm ready for fertilization. The sperm becomes more energetic and mobile. This process makes sure the sperm is in the best possible shape to fertilize the egg.
2. Sperm-Zona pellucida binding- If the sperm encounters an ovum, the process continues with sperm-zona pellucida binding. A receptor-ligand response takes place when sperm attaches to an ovum's Zona Pellucida layer. No further sperm can pass through this layer after this binding process.
3. Zona pellucida penetration - Zona pellucida penetration is made easier by the sperm's head shape, which helps it cut through the ovum's layers. It also restarts the growth of the ovum, which is stopped at one stage of meiosis and only continues once the egg has been fertilized.
4. Acrosome Reaction: Different Zona Pellucida-digesting enzymes are present in the sperm head (acrosome), aiding in the sperm's ability to penetrate further into the layers of the ovum. With deeper entry, the sperm head shrinks. Prior to fertilizing the ovum, sperm must maintain its acrosomal content.
5. Cortical Reaction: The egg is now activated because it was previously frozen at the metaphase stage of meiotic division II. The ovum develops quickly, and exocytosis and the fusion of cortical granules with Zona Pellucida occur at the same time.
6. Zona Reaction: When the Zona Pellucida layer hardens, fertilization is accomplished.
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What is an alternate solution to using pesticides on beetles for natural selectionn and genetic variation
An alternate solution to using pesticides on beetles for natural selection and genetic variation is Polyculture which is also known as Companion Planting.
In this process, partner plants are planted together with crops such that it will support the crops. From a pest-control perspective, it's ideal to plant plants that naturally repel specific pests of your crop.
The replacement of hazardous pesticides can be done for natural selection and genetic variation using the alternatives which are much safer and are sustainable and cost effective. Some of them are listed below:
Integrated Pest ManagementConservation agricultureOrganic agricultureAgroecologyBiological pesticidesBiological pest controlPEATPlantixThe techniques like crop rotation, intercropping and organic pesticides can be used. Also microbes can be used for the destruction of the pests. Integrated pest management, genetic control and the natural methods are some of the other methods.
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differences in these bacterial structures can influence which antibiotics bacteria are susceptible to.
-Gram-positive bacteria,
-Gram-negative bacteria,
-Pathogen bacteria
-antibiotic
Differences in these bacterial structures can influence which antibiotics bacteria are susceptible to, Option A) Gram-positive bacteria.
Differences in bacterial architecture are caused by evolutionary variances as well as differences in cell wall structure.
In contrast, the thick, porous peptidoglycan coating within the cell wall of Gram-positive micro organism allows antibiotics to permeate the cell more easily and/or interact with the peptidoglycan itself. It is critical because understanding what proteins and enzymes the bacterial cell has allows you to understand what needs to be manufactured to prevent the production of those enzymes and proteins. Different microbial systems and types of microbial cells have varying degrees of resistance to the antimicrobial agents used to dispose of them. Endospores are the most resistant form of microorganisms.
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In a leaf, you would expect to find tracheids in thea. epidermis.
b. veins
c. venules
d. arteries
In a leaf, you would expect to find tracheids in the veins (b)
Tracheids are elongated, dead cells that are located in a plant's xylem and are extremely important for transporting water. They are often located inside of the veins, which are in charge of transporting nutrients and water from the roots to the rest of the plant. The epidermis is the top layer of cells that protects the leaves and stems; venules and arteries are normally found in the circulatory systems of animals rather than in leaves.
The vascular system of plants uses veins as conduits to move water and nutrients from the roots to the rest of the plant.
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in eukaryotes, atp synthase is located in the _____________
Both the internal mitochondrial membrane and the extracellular space contain eukaryotic ATP synthase. In plants, mitochondria, cellular debris, and chloroplasts all contain ATP synthase.
Where does ATP synthase reside?The ATP synthase compound is found in the inner mitochondrial membrane of eukaryotes, and the ATP production process happens on the barrier side toward the matrix compartment. The ATP-forming portion of the enzyme is also located in the inner membrane of chloroplasts in plants, with the stroma facing the enzyme.
Why do eukaryotic cells have ATP?All living creatures have the energy-carrying molecule adenosine triphosphate (ATP) in their cells. Chemical energy is generated during the breakdown of food molecules; this energy is absorbed by ATP and utilized to fuel other cellular processes.
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dual innervation means that an individual effector
False, Dual innervation refers to the phenomenon where an organ or tissue is innervated by both sympathetic and parasympathetic nervous systems.
This is common in many organs in the body, including the heart, lungs, and digestive system. The sympathetic and Dual innervation parasympathetic nervous systems have opposing effects on these organs, with the sympathetic system generally promoting activity and the parasympathetic system promoting relaxation. The balance between these two systems is important for maintaining homeostasis in the body. However, dual innervation does not refer to the innervation of an individual effector, but rather to the innervation of an organ or tissue by both sympathetic and parasympathetic nerves.
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The complete Question is:
Dual innervation means that an individual effector. True or false
which structure is highlighted marginal artery right circumflex artery right coronary artery left anterior descending artery left coronary artery
artery on the left side. A branch of the left circumflex artery, it can be discovered at the left AV sulcus. It heads for the top of the heart. the artery on the left that descends anteriorly.
Branches emerge from the left major coronary: The left coronary artery divides into the left anterior descending artery, which provides blood to the front of the left side of the heart. The left coronary artery's left circumflex branch surrounds the heart muscle. The left major coronary artery and the right coronary artery (RCA) are the two primary coronary arteries (LMCA). The aorta's root is the source of both of them. The right atrium and right ventricle are the primary recipients of blood from the RCA, which exits the anterior ascending aorta. Your left main coronary artery has two branches, the left anterior descending (LAD) artery being one of them. Anterior refers to an artery that feeds blood to your heart's front chambers. It is your heart's main source of oxygenated blood for the lower left ventricle, which pumps blood throughout your body.
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The most prominent organelle in a eukaryotic cell is the:_______
Answer:
The nucleus is the most conspicuous organelle found in a eukaryotic cell. It houses the cell's chromosomes.
How should people get the resources they need
Save the resource as much as you can while also taking sustainability and the environment's impact into account. Increase internal product reuse and recycling of (waste) components and materials.
What kind of resources are needed?
Resources are required by humans since they can be used as a raw material to satisfy their demands and comforts. Agriculture depends on natural resources, which increases its economic significance. They also present chances for employment.
A biological resource is a material or feature needed by an organism for healthy development, upkeep, and reproduction. One organism's consumption of resources may make them unavailable to other organisms. The most important resources for plants are sunlight, nutrients, water, and a space to grow.
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which of the following crop commodities is sometimes thought of as the invisible food product? group of answer choices grains sugar crops oil crops tree fruits
Oil crops. Over the previous 30 years, the increased interest has led to an 82% rise in the area under cultivation for oilseed crops and a roughly 240% increase in global production.
Oilseed crops are mostly grown for food oil. Oilseeds have gained increased attention recently due to a rise in demand for their beneficial vegetable oils, livestock feed, medicines, biofuels, and other oleochemical industrial uses. Therefore, to increase oil output per unit area, sustainable oil production must be combined with biotechnological methods in order to meet the growing global demand. Another strategy that might be used to fulfil this rising demand is the extension of oilseed growing regions. Oilseed crops can be produced sustainably through genetic engineering, and their nutritional value will be improved as well.
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A certain cell no longer needs a particular protein in its development.
How does the cell stop production of the protein?
Responses
by using vesicles to transport excess protein from the cell
by recruiting enzymes to break down any additional protein produced
by breaking down the segments of DNA containing the gene for that protein
by repressing transcription and translation of the gene for the protein
When a certain cell no longer needs a particular protein in its development, the cell stops the production of the protein by repressing transcription and translation of the gene for the protein.
The correct option is D.
What is the process of gene repression?Gene repression is the process of turning off specific genes whose byproducts are required to keep a cell functioning, such as the creation of essential cofactors or enzymes. This is crucial if the end products of these genes are short-lived, degraded, or metabolized.
Gene repression represses gene expression when the gene product such as a protein is no longer needed by the cell in its development.
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every biomolecule featured in this video contains what element?
All biological molecules were organic molecules, which means they all include carbon atoms. Include polysaccharides, nucleic, lipids, carbohydrates, proteins, and amino acids.
What exactly are biomolecules and what do they do?Biomolecules are organic molecules that are made up of lipids, proteins, carbohydrates, and nucleic acids. For live cells to survive, they are crucial. There is a high demand for several biological macromolecules that cannot be satisfied by their renewable supplies.
What is a brief explanation of a biomolecule?A chemical substance that is present in living things is called a biomolecule. These consist mostly of substances with the chemical elements carbon, gas, oxygen, nitrogen, sulfur, and phosphorus. The foundation of life, biomolecules serve crucial roles in all living things.
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Please help me in your own words don’t copy off the internet
1) Anthropogenic activities have caused the amount of carbon in the atmosphere to increase considerably in the past century.
2) By reducing the use of the fossil fuels using alternative energy sources. The human impact on the carbon cycle can be curbed.
How does human beings affect the carbon cycle?Human activities have a significant impact on the carbon cycle, which is the flow of carbon through the Earth's atmosphere, oceans, and land. The carbon cycle plays a crucial role in regulating the Earth's climate, as it helps to balance the levels of carbon dioxide (CO2) and other greenhouse gases in the atmosphere.
Human activities have caused a significant increase in the amount of CO2 in the atmosphere, leading to changes in the carbon cycle
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an ecologist estimated 800 star-nosed moles, condylura cristata, per square mile in one woodlot and 1,600 per square mile in another woodlot. what was the ecologist comparing?
An ecologist estimated that in one woodlot there were 1,600 star-nosed moles (Condylura cristata) while in another there were 800. Ecologists compared the star-nosed mole population density.
What is the star-nosed mole dental formula?In dentistry, I 3/3, C 1/1, P 4/4, and M 3/3 equal 44. (Figure 1). The eyes are small and partially hidden in the pelage, and the pinnae are missing. Dense, silky, and velvety, the pelage is primarily blackish-brown to black dorsally and just little paler ventrally.
What is the star-nosed mole's range?A star-nosed mole of average size measures 19 mm (7.6 in) in length and weighs 50 g. (1.8 oz). Range and environment: Southeast Manitoba to Labrador make up the range Southeast Georgia, south and east to Nova Scotia.
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a woman is a carrier for a sex-linked lethal gene that causes spontaneous abortions. she has nine children. how many do you expect to be boys?
This woman has three male offspring. The lethal gene resides on the X chromosome since the woman is the carrier. This indicates that there is a 50% possibility that the fatal gene would influence the progeny. As the ratio would be 2:1, there are 3 male children and 6 female children.
Alleles that cause the death of the carrying organism are referred to as lethal or deadly alleles. They frequently result from modifications to genes that are essential for growth or development. Lethal alleles can also be recessive, or dominant, or conditional, based on the genes which are involved. After a protracted period of development that appears normal, deadly alleles can be postnatally or perinatally lethal. In the event that they are embryonically fatal, the foetus won't survive past the first trimester. Alleles that are embryonically lethal are what create non-Mendelian patterns of inheritance, such as the observation of characteristics in a 2:1 ratio.
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The principle by which we organize the perceptual field into stimuli that stand out (figure) and those that are left over (ground).
The guideline by which we put together the perceptual field into improvements that stick out and those that are left over is known as the "Figure-Ground" relationship.
This guideline assists with making sense of how we separate between an object of concentration and its encompassing setting (the ground). The figure-ground relationship is a principal part of discernment that assists us with getting a handle on the complex tangible data we get from the climate.
For example, a ticking clock on the wall could at first be very diverting while you are sitting a test in a study hall. With training, your cerebrum will start to consequently sift through foundation commotion so you can center.
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what would most likely happen if only one oligonucleotide primer was used in pcr? group of answer choices the primer would amplify both strands, but only produce half as much dna as if two primers were used. the primer would be unable to anneal and would not amplify any dna. the primer would be denatured by the high temperatures used to melt the dna. the primer would amplify only one strand so that double stranded dna would not be produced. the primer would amplify both dna strands, producing the same amount of dna as if two primers were used.
Option (D) is the correct answer. The primer would amplify only one strand so that double-stranded DNA would not be produced.
The polymerase chain reaction, or PCR, creates millions of copies of a particular DNA sequence using a method analogous to DNA replication that takes the use of heat-resistant bacterial equipment. Electrophoresis can then be used to view the sequence. The DNA template is duplicated via PCR and cell-based DNA replication. The polymerase chain reaction is known as PCR. Finding genetic material from a specific creature, such as a virus, is the goal of the test. If so, the test will show whether you are currently infected with a virus. When only one primer is used, the process is known as asymmetric PCR. Because only one new copy is made per cycle and only one strand of the double-stranded DNA will be amplified, exponential amplification is not conceivable.
The proper question is:
What would most likely happen if only one oligonucleotide primer was used in PCR? group of answer choices:
(A). The primer would amplify both strands, but only produce half as much DNA as if two primers were used.
(B). The primer would be unable to anneal and would not amplify any DNA.
(C). The primer would be denatured by the high temperatures used to melt the DNA.
(D). The primer would amplify only one strand so that double-stranded DNA would not be produced.
(E). The primer would amplify both DNA strands, producing the same amount of DNA as if two primers were used.
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What are the two stages plants go through during their life cycle?
Answer: One is the haploid phase, also known as the gametophyte phase, and the second is the diploid phase, also known as the sporophyte phase.
Explanation:
Answer:
The vegetative stage and the reproductive stage
Explanation:
Plants typically go through two stages in their life cycle: the vegetative stage and the reproductive stage. In the vegetative stage, the plant focuses on growing leaves, stems, and roots. In the reproductive stage, the plant produces flowers, seeds, and fruit in order to reproduce.
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QuestionThe production of a new individual from the parent is called AReproductionBPropagationCCloningDNone of the aboveMedium
The production of a new individual from the parent is called Reproduction option a)
Reproduction is the process of producing children. It is possible to reproduce in two ways: sexual reproduction and asexual reproduction. An organism that reproduces sexually integrates the genetic information from both parents and is genetically distinct. Asexual reproduction occurs when one parent copies itself to produce genetically identical kids.
The process of producing new species/organisms is known as reproduction. Sexual and asexual reproduction are both possible. Reproduction is necessary for the survival of a species. It ensures that similar types of people be passed down from generation to generation.
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How can glucosinolates provide a defense for plants against being eaten?
The usual sharp flavour of these foods is caused by glucosinolates. These chemicals do not have biological activity by themselves, but when they are hydrolysed by myrosinases, several breakdown products are created that aid in plant defence.
The ability of glucosinolates to defend against herbivores is well known, but recent research has indicated that they are also effective against microbiological infections. As a result, glucosinolates can also help prevent and treat some types of cancer. Some specialised glucosinolates breakdown products can also help control microbial infectious disease in humans. The presence of glucosinolates as phytoanticipins is inherent in the plant, but different forms of glucosinolates are generated in response to herbivore or pathogen attack. Particularly the (indolic) glucosinolates generated from tryptophan react sensitively to the various forms of hormone signalling cascades upon infection.
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The lineage that leads from the last common ancestor of chimps and humans to living humans contains all the species in the
superfamily Hominoidea
genus Astralopithecus
family Hominidae
genus Homo
tribe Homininae
The clan Homininae mixes all types of great primates that are more firmly tied with people than chimpanzees and gorillas, including the variety Homo, which has present-day people (Homo sapiens). Here option D is the correct answer.
The family Hominidae, which incorporates the clan Homininae and a few terminated genera, contains all types of extraordinary primates and their wiped-out family members.
The superfamily Hominoidea, which incorporates the family Hominidae and a few different groups of primates, envelops all types of monkeys and gorillas, including people. The variety Australopithecus, which lived in Africa somewhere in the range of quite a while back, is definitely not an immediate predecessor of present-day people, however, is viewed as a direct relation.
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1. Which scientist's ideas eventually lead to the theory that Earth is several billion years old?
A. Charles Lyell
B. Alfred Russel Wallace
C. Georges Cuvier O
D. Jean Baptiste Lamarck
Answer:
C. George Cuvier
Explanation:
During the 19th century, Georges Cuvier developed his own theory of catastrophes. Fossils show that animal and plant species are destroyed time and again by floods and other natural disasters, and that new species evolve shortly after that.
plpa the environmental factor that adversely affects plant growth most commonly is group of answer choices air pollution excess or deficiencies of water pesticide drift iron deficiency none of the others
Water deficiency in excess is the environmental condition that most frequently harms plant growth.
As a result of the sensitivity of the majority of crop plants to salinity, which is brought on by high salt concentrations in the soil, and the fact that more and more land is being affected by it every day, salinity is one of the harshest environmental factors limiting the productivity of crop plants.
Thought to have originated in East Africa, coffee rust, which is caused by Hemileia vastatrix, moved to Sri Lanka (then known as Ceylon) in the 1860s and severely damaged plantations, ultimately putting an end to production within 20 years (Talhinhas et al., 2017). These plant pathogens must spread to infect new hosts for epidemics of plant diseases to manifest. Pollen and seeds from infected plants, as well as soil, rain, water, animals, people, and machinery, can all transmit plant illnesses.
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what term describes the probable genotype of a healthy diploid individual who is a carrier of a lethal allele but is unaffected by that lethal allele?
The term heterozygote describes the probable genotype of a healthy diploid individual who is a carrier of a lethal allele but is unaffected by that lethal allele.
The presence of two different alleles at a particular locus. A heterozygous genotype may include a normal allele and a mutant allele, or two different mutant alleles (a compound heterozygote).
Homozygous recessive (pp), homozygous dominant (PP), and heterozygous genotypes are the three types of genotypes (Pp). Homozygous dominant and heterozygous genotypes show the same phenotype. If the two versions are different, the genotype for that gene is heterozygous. For example, being heterozygous for hair color means having one red hair allele and one brown hair allele. The relationship between two alleles affects the traits expressed. Due to the nature of the X-linked inheritance pattern, a female is either homozygous or heterozygous for her X-linked trait, whereas a male has her X chromosome, for which she has only one. Therefore, it becomes a hemizygous type.
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bile aids digestion by emulsifying ____________ in the watery mixture of chyme.
Bile is a greenish-yellow fluid that is produced by the liver and stored in the gallbladder. One of the main functions of bile is to aid in the digestion and absorption of fats in the small intestine.
Bile contains bile salts, which are specialized molecules that act as emulsifiers to break down fats into smaller droplets. Emulsification is the process of breaking up larger fat droplets into smaller, more manageable droplets that can be more easily acted upon by digestive enzymes. This increases the surface area of the fat, making it more accessible to lipases, which are enzymes that break down fats.
In the watery mixture of chyme, which is a mixture of partially digested food and digestive juices that is produced in the stomach, bile emulsifies the fat in order to make it easier for the lipases to break down. This allows for more efficient absorption of the fat in the small intestine.
In summary, bile aids in digestion by emulsifying fats in the watery mixture of chyme. This is accomplished through the action of bile salts, which break down larger fat droplets into smaller droplets that are more accessible to digestive enzymes
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Why do more chromosomes result in increased recombination?
More chromosomes result in increased recombination because they are involved in crossovers which results in recombination and the exchange of genetic material between the maternal and paternal chromosomes.
What is a Chromosome?This is referred to as a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
They are involved in crossovers which is why in a scenario where there are more chromosomes then there is increased recombination thereby making it the correct choice.
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the melanocytes responsible for fur pigmentation in dogs originate as precursor cells called melanoblasts found in which area of the embryo?
The fur of a dog will have white patches if cells called melanocytes do not produce the pigment melanin.
Your body contains melanin, which is responsible for the color of your skin, eyes, and eyebrows. The darker your eyes, hair, and skin will be the more melanin you will create. The amount of melanin in your body relies on a variety of factors, including how features are passed on from parents to children and how many stars in your family tree were involved. If the mentioned containers do not manufacture the pigment melanin, a dog's jacket will have silvery spots. The CcPp plant exhibits complementation, demonstrating that the genes involved in the mutations preventing color in the silver plants are unaffected. Due to a specific deoxyribonucleic acid primary allele, corn kernels can have a lilac tint.
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5. The model below represents the percent of people with blue eyes at a city event. What
decimal best represents the percent of people who do not have blue eyes?
25.%
loor
OManeuvering the L
Answer:
0.75
Explanation:
To calculate the percent of people who do not have blue eyes, we need to subtract the percent of people with blue eyes (25%) from 100%. Therefore, the decimal that best represents the percent of people who do not have blue eyes is:
100% - 25% = 75%
As a decimal, this is:
75% = 0.75
Tell me if you still confuse
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