Charles Darwin and Alfred Russel Wallace developed the theory of evolution by natural selection.
Key points:
Charles Darwin and Alfred Russel Wallace independently developed the theory of evolution by natural selection in the mid-19th century.Darwin's theory was first presented in his 1859 book "On the Origin of Species" and Wallace's ideas were presented in a joint paper read at a meeting of the Linnean Society in London in 1858.The theory of evolution by natural selection states that species change over time through the process of natural selection, where organisms with advantageous traits are more likely to survive and reproduce, passing on those traits to their offspring.This process leads to the gradual adaptation of populations to their environment over many generations.The theory of evolution by natural selection is considered one of the most important scientific theories of all time, as it provides a framework for understanding the diversity of life on Earth and how it has changed over time.Learn more about the natural selection here:
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what would happen if a cell went through mitosis without finishing s phase?
DNA replication in the S phase is necessary for mitotic cell division.
As the parent cell evenly divides its nuclear material across the two daughter cells, this stage is crucial for cell division. Every generation, the number of chromosomes will fall by half if there is no S phase. DNA synthesis or replication takes place during the S phase of the a cell cycle, which happens during interphase and comes before mitosis or meiosis. By doing this, a cell's genetic material doubles before it begins mitosis or meiosis, providing enough DNA for the cell to divide into daughter cells. The goal of the very dynamic process of mitosis is to divide identical copies of the genome into two daughter cells. Cells are produced when the mitotic process fails.
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correctly label the following parts of the pericardium and the heart walls.
The outer layer of the heart wall is the epicardium, the middle layer is the myocardium, and the inner layer is the endocardium.
what are the parts of the pericardium and the heart walls?
The pericardium consists of two layers: the fibrous and the serous. The fibrous pericardium is a conical-shaped sac. Its apex is fused with the roots of the great vessels at the base of the heart. Its broad base overlies the central fibrous area of the diaphragm with which it is fused.The pericardium is the fibrous sac that surrounds the heart. It can be divided into three layers, the fibrous pericardium, the parietal pericardium, and the visceral pericardium. The parietal and visceral pericardia together form the serous pericardium.The main difference between myocardium and pericardium is that the myocardium is the muscular layer of the heart made up of heart muscles whereas the pericardium is the fibrous encase of the heart made up of connective tissue.To learn more about heart walls refers to:
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Which sequence of events describes the path of groundwater to the ocean?
OA. Infiltration → aeration → saturation → entering ocean
OB. Runoff→ saturation → aeration entering ocean
OC. Precipitation
C. Precipitation
→ infiltration → saturation → entering ocean
→ infiltration → underground flow → entering ocean
OD. Precipitation
D. Precipitation
→ infiltration → underground flow → entering ocean. Option C describes the path of groundwater to the ocean:
Precipitation: Water falls from the sky as rain or snow and lands on the surface of the Earth.
Infiltration: Some of the precipitation seeps into the ground, becoming groundwater.Underground flow: The groundwater flows through the soil and rock underground, following the path of least resistance.
Entering the ocean: As the groundwater reaches the coastal area, it emerges from the ground and enters the ocean, either through a spring or by seeping into the ocean.
Groundwater is water that is found underground in the spaces between soil particles and rocks. It is a vital source of fresh water for many people and ecosystems worldwide. Groundwater is replenished by precipitation that seeps into the ground and is stored in underground rock formations called aquifers
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Why was Wegener's theory of continental drift almost completely discarded?1)It didn't explain how mountains formed.2)It didn't explain how continents fit together.3)It didn't have a mechanism for how drift occurred.4)It wasn't supported by fossil evidence
Wegener's theory of continental drift was almost completely discarded because it didn't have a mechanism for how drift occurred (Option 3).
The theory of continental drift was proposed by Alfred Wegener to explain the current position of the continents. According to this theory (continental drift), continents once formed a super landmass called Pangea. In conclusion, Wegener's theory of continental drift was almost completely discarded because it didn't have a mechanism for how drift occurred (Option 3).
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separation of homologous chromosomes occurs during____
separation of homologous chromosomes occurs During meiosis.
Which stage does the separation of homologous chromosomes occur?Anaphase I: The spindle fibers have fully attached by anaphase I.Pulling apart, the homologous chromosomes travel to the opposing ends of the cell.
In anaphase 1 or 2, do homologous chromosomes separate?In anaphase I, spindle fibers connected to the centrioles pull the sister chromatids pairs apart and to the cell's two opposite poles.Telophase I marks the conclusion of this initial cell division process.
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continuous sequence of growth (interphase) and division (mitosis) in a cell. cell growth phase where a cell increases in size, carries on metabolism, and duplicates chromosomes prior to division. period of nuclear cell division in which two daughter cells are formed, each containing a complete set of chromosomes.
The cell cycle is a four-stage procedure in which the cell enlarges replicates its DNA gets ready to divide ( and splits (mitosis, or M, stage).
What is the cell's continuous process of growth, interphase, and division during mitosis?The cell cycle is a four-step process in which the cell grows in size (gap 1, or G1, stage), duplicates its DNA (synthesis, or S, stage), gets ready to divide (gap 2, or G2, stage), and divides (gap 3, or S, stage) (mitosis, or M, stage). Interphase, which accounts for the time between cell divisions, is made up of the phases G1, S, and G2.Interphase. The cell prepares for cell division during interphase while simultaneously going through regular activities. Numerous internal and external requirements must be satisfied for a cell to transition from the interphase to the mitotic phase.To learn more about cell refer to:
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myelin increases the speed of conduction because it
Myelin increases the speed of conduction because it acts as an insulator.
Myelin is a fatty substance that surrounds the axon of certain nerve cells, it is composed mainly of lipids. It acts as a barrier between the axon and the surrounding tissue, which helps to increase the speed of action potential conduction along the axon.
Myelin helps to speed up conduction in two main ways:
Saltatory conduction: Myelin allows for saltatory conduction, which means that the action potential "jumps" from one node of Ranvier (an unmyelinated region of the axon) to the next, rather than traveling the entire length of the axon.
This is a more efficient method of conduction and allows for faster transmission of signals.
Reduced membrane capacitance: The myelin sheath reduces the capacitance of the membrane and thus reduces the amount of current required to initiate an action potential.
Overall, the presence of myelin allows for faster and more efficient conduction of nerve impulses, which is important for proper nervous system function.
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Role of leaf in excretion
Leaves play an important role in excretion in plants. They are responsible for removing waste products, such as carbon dioxide and water, that are produced during photosynthesis and cellular respiration.
One of the main ways that leaves excrete waste products is through transpiration, which is the process of releasing water vapor from the leaves through small openings called stomata. This process not only helps to remove excess water from the plant, but it also helps to release waste gases such as carbon dioxide and oxygen that are produced during photosynthesis.
Leaves also excrete waste products through guttation, which is the release of water droplets from the leaves. This process helps to remove excess water that is not needed by the plant.
Additionally, leaves also excrete waste products in the form of excess minerals, which are not needed by the plant and are removed via root exudation.
In summary, leaves play a crucial role in excretion in plants by releasing waste products such as carbon dioxide, water, and excess minerals via transpiration, guttation, and root exudation.
What happens to undigested unabsorbed food in left in small intestine?.
The undigested food stuff enters the colon, where the majority of the water is reabsorbed, after passing through the small intestine.
The stomach and small intestine are where the majority of food is digested, but the large intestine receives the leftover food that hasn't been fully broken down. The water in the large intestine is absorbed, and the food that is still undigested is kept in its lower portion, or rectum. It subsequently transforms its undigested food into the semi-solid substance that is kept in the rectum.
The food is subsequently moved from the rectum to the urine bladder, the urethra, and ultimately the anus region, where it is then expelled from the body.
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The unabsorbed food in small intestine will be pushed to large intestine due to contractions. If it contains any nutrients, water or minerals are absorbed from food. The leftover is considered as waste which leads into bowel.
As we know the function of small intestine is that the intestinal juices secreted by the wall of small intestine breaks down starch and carbohydrates into simple sugars.
If food does not contains any complex carbohydrates or starch then it will be pushed to large intestine.
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In the box below, draw a flowchart that explains the relationship between m: Skeletal muscles, fascicles, muscle fiber, and myofibrils
Each fascicle is made up of multiple muscle fibers and is surrounded by connective tissue known as the perimysium (or muscle cells).
What is skeletal muscle?One of the three important muscle tissues in the human body is found in the skeleton.
Thousands of muscle fibers are encased in connective tissue sheaths to form each skeletal muscle. Fasciculi are the individual bundles of muscular fibers that make up skeletal muscles.
Each fascicle contains several muscle fibers and is encased in perimysium, a connective tissue (or muscle cells).
The endomysium that covers muscle cells is made up of numerous fibrils, or myofibrils, and these myofibrils are composed of myofilaments, which are long protein molecules.
Thus, this is the relationship between skeletal muscles, fascicles, muscle fiber, and myofibrils.
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this type of exercise builds up lactic acid because of the lack of oxygen.
Lactic acid builds up and much less ATP is produced by the anaerobic energy system than by the aerobic energy system.
What exercises use the lactic acid system?The lactic acid system will be utilised and the body will experience oxygen debt in any activity or event demanding a sustained burst of high intensity exercise.Our bodies burn fat and glycogen as energy when we exercise aerobically. Over an extended length of time, this low to moderate degree of effort can be maintained. Exertion causes your breathing to become heavier as your body releases carbon dioxide. Unlike with anaerobic activity, no lactic acid is created.The body's method for fast producing ATP is known as the anaerobic energy system, also known as the lactic acid system. The muscles are powered for ten to thirty seconds by this energy system, which mostly uses glucose as fuel.To learn more about aerobic refer to:
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The ability of a living system to survive moderate disturbances.Ecosystems with a high species richness usually have more inertia, and are resistant to major changes.
Inertia is the ability of a living system to survive moderate disturbances.
Living systems have the power of inertia, which allows them to withstand and recover from moderate disturbances or changes in their environment. Inertia is the capacity of a living system to maintain its equilibrium and keep functioning despite fluctuations and disruptions.
This ability of a living system to stay in balance and continue on its path of growth and development is an essential quality that helps it survive even in the face of potentially dangerous changes.
Inertia is the key to resilience in living systems, allowing them to remain resilient in the face of adversity.
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PLEASE ANSWER QUICKLY!!!!
Explain the importance of the sequence of nitrogen bases on a gene to heredity.
Answer:
o store the genetic information of the organisms in them.
What is the probability that the offspring will have purple flowers?.
There is a 50% chance that the offspring will have purple blooms. Let's suppose for the moment that: The flower hue is matched to allele A.
As a result, A would represent the dominant purple colour and substitute for the alternate white hue. In accordance with the aforementioned assumptions, a heterozygous purple blossom would have the genotype Aa, whereas a white flower would have the genotype aa.
Let's join the two blossoms now:
Aa x aa
A A A an an a
Based on the results of the cross, the genotypes, phenotypes, and chances of the children would be as follows:
Color purple, Aa; half
Aa, 1/2, white flower colour
To put it another way, there is a 50% chance that the cross will produce children who are flower-related.
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True or False: The right hypochondriac region contains the majority of the stomach.
Answer:False
Explanation:
This is a false statement because the stomach is found it in the left hypochondriac region of the stomach.
What is the right hypochondriac region?In the anatomy, the hypochondriac regions state a region are the two superolateral regions of the abdomen that lie on either side of the epigastric region.
It includes the liver (right lobe), gallbladder, hepatic duct, and right colic angle that are found in the right hypochondriac region.
In the left hypochondriac region, the majority of the components of the stomach are found, and the top of the left lobe of the liver, parts of the small intestine, and components of the transverse and descending colon, the left kidney, the spleen and the tail of the pancreas.
Therefore, the right hypochondriac region containing the majority of the stomach is a false statement.
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What is the color of light that chlorophyll absorb that has the highest energy?.
The color of light that chlorophyll absorbs that has the highest energy is red and blue.
Most leаves come in vаrious shаdes of green. This is due to pigments cаlled chlorophyll. The nаme comes from the Greek words chloros (green) аnd phyllon (leаf). There аre six types of chlorophyll in nаture. The two mаin types in plаnts аre chlorophyll а аnd chlorophyll b.
In the true color of chlorophyll а the mаximаl аbsorption in the red region is аt 642 nm аnd in the blue region аt 372 nm; for chlorophyll b the vаlues аre 626 nm аnd 392 nm, respectively. This meаns thаt the environment red-shifts the аbsorption spectrа of chlorophyll in plаnt cells or, in other words, chlorophyll pigments аre bluer thаn we think.
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Using both articles "Using Forests Wisely" and "Community Conservation" answer the following questions.
Summarize the scientific information that leads to conservation in each of the articles.
What social issues affected the problem or its solution in each of the stories?
How did economics delay scientists' first attempts at conservation in each story?
Describe the political actions that led to successful conservation in both stories.
"Using Forests Wisely" describes the importance of managing forests sustainably in order to preserve their ecological and economic benefits.
The article highlights scientific research on the role of forests in regulating water cycles, preventing soil erosion, and providing habitat for biodiversity. It also discusses the economic benefits of sustainable forestry, such as long-term timber yields and carbon sequestration.
How to explain the article?"Community Conservation" discusses the importance of involving local communities in conservation efforts in order to ensure their success. The article highlights scientific research on the effectiveness of community-based conservation in protecting biodiversity and preserving traditional knowledge and culture.
In both articles, social issues such as poverty and lack of education can affect the problem and its solution by making it difficult for local communities to participate in conservation efforts. Additionally, in "Using Forests Wisely" the article states that illegal logging and land clearance for agriculture are major drivers of deforestation, which undermines conservation efforts.
Economics also played a role in delaying scientists' first attempts at conservation in both stories. In "Using Forests Wisely", the article states that short-term economic incentives such as clear-cutting for timber often conflicted with the long-term benefits of sustainable forestry. In "Community Conservation" the article states that lack of funding and resources can make it difficult for community conservation groups to implement their plans.
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What is the age difference between Jamie and Claire in the books?.
Jamie's activities were legal; therefore, a judge would reject this argument. The judge will not pursue the matter further since he has the right to free expression.
According to this concept, speech can be used to express feelings or sentiments. Additionally, they convey a message to the other party that they want them to comprehend. Speeches are commonly used to sway the attitudes of an individual or a group of individuals. Jamie has been granted a right, so this. The judge will not pursue the matter further since he has the right to free expression, which does not imply that he can say whatever he wants. After the judge has reviewed all the evidence and ensured that all sides have been heard, a decision will be made. Jamie's activities were legal; therefore, a judge would reject this argument.
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bats and hummingbirds both have wings and can fly. this is due to__________.
cell division in Laphorina superb
Lophorina Superba is a bird species and therefore the undergone both mitotic cell division for somatic cells and meiotic cell division for germinal cells.
What is mitotic cell division?The process of mitosis cell division is based on the generation of genetically identical body cells, while meiotic cell division generates cell having half of the genetic material which will form the gametes in species of sexual reproduction such as for example birds.
Therefore, with this data, we can see that both mitotic and meiotic cell divisions occur in bird species such as Lophorina Superba.
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substances in the body can move from areas of high concentration to low concentration; down a concentration ______.
Substances in the body can move from areas of high concentration to low concentration; down a concentration gradient.
The human body is a complex system of chemical processes and interactions.
One of the most important processes is the movement of substances from areas of high concentration to areas of low concentration, otherwise known as a concentration gradient.
This process is important for the proper functioning of various systems within the body, as it helps to regulate and maintain equilibrium. When substances move down a concentration gradient, it helps to keep the body in balance and functioning properly.
Our bodies rely on the movement of substances from areas of high concentration to low concentration, down a concentration gradient. This is a process that occurs naturally, as substances are transported around the body in order to maintain balance and homeostasis.
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what type of bond holds together the complementary nucleotides?
Hydrogen bonds holds together the complementary nucleotides.
The fundamental building blocks of DNA and RNA are nucleotides, which are held together by covalent bonds.
The type of bond that holds together the complementary nucleotides is a Hydrogen bond, which is a weak bond formed between two molecules due to electrostatic interaction.
Hydrogen bonds form between the two complementary nucleotides when their hydrogen atoms are attracted to the lone pair of electrons on the other molecule. These bonds are much weaker than covalent bonds, but are essential for the stability of the DNA and RNA molecules.
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Which two substances does the Calvin cycle produce?
a. H2O
b. ADP
c. CO2
d. a 3-carbon sugar
Answer:
b) ADP
d) a 3-carbon sugar
Explanation:
The Calvin cycle is one of the biological processes that happen in the chloroplast stroma during photosynthesis. Its main job is to turn CO2 into glucose, a sugar with three carbons.
The Calvin cycle makes the production of two substances:
a 3-carbon sugar: At the beginning of the Calvin cycle, carbon dioxide molecules are fixed and changed into 3-phosphoglycerate. This 3-carbon molecule is changed into glyceraldehyde-3-phosphate (G3P) by enzymes. Some G3P molecules make the original donor molecule full again, while others make glucose and other carbs.Adenosine diphosphate (ADP) is a key part of how cells use energy. ATP powers the steps in the Calvin cycle. Through cellular metabolism, ATP is used up and turned back into ADP. ADP can be replaced and turned back into ATP.Find out more about what photosynthesis produces.
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Cancerous cells sometimes have odd numbers of chromosomes. What checkpoint did those cells bypass/ignore?
a. None of the above
b. The G1 Checkpoint
c. The G2 Checkpoint
d. The M Checkpoint
Answer:
d
Explanation:
How does crossing over in meiosis lead to genetic diversity and ultimately higher survival rates in population?.
The biological process of crossing over occurs during prophase I of meiosis when genetic material is transferred across non-sister chromatids of homologous chromosomes. By giving offspring distinct chromosomes from their parents, chromosomal crossing enhances genetic variety. It is a significant factor causing genetic variation among progeny, which would otherwise cause a large degree of defects or illnesses.
Meiosis specifically produces novel genetic material combinations in each of the four daughter cells. These novel pairings are the result of DNA switching between linked chromosomes. Because of this interaction, the gametes created during meiosis display a remarkable diversity of genetic variation. When genes cross over or recombine during meiosis, the alleles on each chromosome of a homologous pair are rearranged, enabling the mixing of father and maternal genes, either of which can be expressed in the progeny.
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A bacteria culture begins with 11 bacteria that triple in amount at the end of every hour. how many bacteria are grown during the 7th hour?
Answer:
(d) 24057
Explanation:
You want to know how many bacteria are grown during the 7th hour in a culture that starts with 11 bacteria and triples in amount at the end of every hour.
GrowthIf the starting number is 11 at hour 0, then there will be triple that number, 11×3 = 33 at the end of the 1st hour. At the end of the 2nd hour, the number will be triple that, or 33×3 = 99.
The number of bacteria at the end of h hours can be modeled by ...
b = 11×3^h
Using this formula, we find the number at the end off the 7th hour to be ...
b = 11×3^7 = 24057
24057 bacteria are grown during the 7th hour.
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major support cells of the nervous system which aid in the formation of a permeability barrier between blood and neurons
Major support cells of the nervous system which aid in the formation of a permeability barrier between blood and neurons are glial cells.
Glial cells works in support and function of neurons in the nervous system. They also helps to provide structural support and insulation for neurons, They also helps in maintaining a healthy blood supply within the brain, and function as immunological sentinels.
Glial (Neuroglial) cells are not responsible for conducting nerve impulses, instead they are responsible for supporting and protecting the neurons. Glial cells are far more in number than neurons and also capable of mitosis. Blood–brain barrier is made of endothelial cells of the capillary wall and pericytes that is embedded in the capillary basement membrane.
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a group of cells that perform a common function is called
Tissue is a group of cells that perform a common function. The cells in a tissue are organized in such a way that they together can perform specialized work.
A tissue is made up of a group of cells. These cells are connected in such a way that they can communicate and perform the same task. There are two types of tissues; that are, simple tissues and complex tissues. Several tissues can combine together to form an organ.
Simple tissues are made up of only one type of cell. Examples of simple tissues are parenchyma, collenchyma, and sclerenchyma. Complex tissues are made up of different types of cells. Blood is a complex tissue, which is made up of red blood cells, platelets, and white blood cells.
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What are the names of the bones at A, in order from left to right? malleus, incus, stapes malleus, stapes, incus stapes, malleus, incus incus, stapes, malleus
The bones at A are named malleus, incus, and stapes, from left to right.
The middle ear is made up of the tympanic membrane and the bony ossicles known as the malleus, incus, and stapes. The tympanic membrane is connected to the inner ear by these three ossicles, which allow sound waves to pass through.
The malleus, incus, and stapes are three ossicles in the middle ear canal that run from lateral to medial.
Three small ossicles found in the middle ear are the hammer (or malleus), anvil (or incus), and stirrup (or stapes).
The malleus, incus, and stapes are three tiny bones found in the middle ear known as ear ossicles. The ossicles' names were given to them because of their distinct shapes.
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cellular structures and molecules vary greatly in size, number, and distribution.
1.Ribosome
2.ATP synthase
3.Rubisco
4.Phosphofructokinase
5.tRNA
is figure to rank the following structures and molecules from largest to smallest.
What is cellular structure?
The body contains a wide variety of cell kinds, sizes, and forms. The idea of a "generalised cell" is introduced for descriptive reasons. All cell types' features are present. The cell membrane, the nucleus, and the cytoplasm are the three components that make up a cell. Intricate arrangements of microscopic fibres and hundreds or even thousands of tiny, unique structures known as organelles can be found in the cytoplasm.
Four elements are present in all cells: 1) a plasma membrane, an outer covering that separates the interior of the cell from its surroundings; 2) cytoplasm, a jelly-like area inside the cell where other cellular components are found; 3) DNA, the cell's genetic material; and 4) ribosomes, small proteins that are found in the interior of the cell.
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