The nucleus can't be seen at the end because the nucleus envelope breaks down and nucleus disappears
Explanation :-
** chromosomes contract , spiral and becomes visible even in light microscope and nucleoli becomes smaller(material to chromosomes)
** chromosomes split length wise to form chromatids connected by centromeres
** nuclear membrane breaks down
** nucleus disappears
The oldest oceanic crust is
a. found at the mid-ocean ridges.
b. beneath the least amount of sediment.
c. older than the oldest continental crust.
d. less than 180 million years old.
The oldest oceanic crust is found at the mid-ocean ridges. Thus, option "A" is correct.
How old is the youngest oceanic crust?The ocean crust is about younger than 200 million years (for example, smaller than 5% of the age of the earth).
The crust is most naive (still being created by volcanic eruptions) along the axis of the mid-ocean ridges and increases in age down the sides of the mid-ocean rises and out onto the more serious basin floors.
Thus, option "A" is correct.
To learn more about oceanic crust click here:
https://brainly.com/question/1101764
#SPJ1
Natural resources are spread equally within a city is that true ?
Mr. Schultz was still working when he first qualified for medicare. At that time, he had employer group coverage that was creditable. During his initial part d eligibility period, he decided not to enroll because he was satisfied with his drug coverage. It is now a year later and mr. Schultz has lost his employer group coverage within the last two weeks. How would you advise him?.
Mr. Schultz should enroll in a Part D plan before he has a 63-day break in coverage in order to avoid a premium penalty.
EVIDENCE FOR EVOLUTION 3 OF 3 Biogeography Evidence Oceanic islands can be home to species found nowhere else on Earth. Why? Island habitats are more diverse than non- island habitats. Islands are free of disease and carnivores. Islands are often isolated, minimizing gene flow and maximizing diversification. Island habitats are stable, minimizing adaptation and maximizing reproduction.
The statement 'Islands are often isolated, minimizing gene flow and maximizing diversification' explains why islands may have unique species on Earth.
What is isolation?Isolation refers to the absence of gene flow between individuals of the same species for extended periods of time.
Isolation due to geographic barriers (e.g., a island) may led to reproductive differentiation and even to speciation.
In conclusion, the statement 'Islands are often isolated, minimizing gene flow and maximizing diversification' explains why islands may have unique species on Earth.
Learn more about speciation here:
https://brainly.com/question/2113835
#SPJ1
What is the function of the primers in pcr?
The function of primers in polymerase chain reaction is that it serves as the starting point for DNA synthesis.
Function of primers in Polymerase chain reaction
Primers function in PCR by;
Primers serve as the starting point for DNA synthesisThe polymerase enzyme can only add DNA bases to a double strand of DNA. Only once the primer has bound can the polymerase enzyme attaches.Thus, the function of primers in polymerase chain reaction is that it serves as the starting point for DNA synthesis.
Learn more about polymerase chain reaction here:
https://brainly.com/question/9649603
#SPJ12
what is the purpose of a control
what is the significance of diffusion and osmosis in living organism ?give one example in support of your answer
Answer:
Diffusion is the process in which molecules and ions move from a region of high concentration to low concentration. Its also how cells transport waste out of the cell and nutrients into it hence being very crucial. Diffusion also occurs without the expenditure of extra energy using a procedure known as passive transport. (Osmosis is a form of diffusion but deals with water exclusively).
Examples of where diffusion is important;
In the intestines - Digested food molecules such as amino acids and glucose move down the concentration gradient from the intestine into the bloodstream. Wastes such as carbon dioxide or urea travel via diffusion from the body's cells to the bloodstream.
Osmosis plays a major role in living organisms. It aids in the transportation of nutrients from cells to cells and also helps to remove the waste's metabolic products from the cell. The purification of blood in the kidneys is also dependent on the process of osmosis.
Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called:.
Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called microvilli.
What is microscopic folds?Microscopic folds are those fold that are found above an epithelial cell of an organ where maximum absorption takes place.
These microscopic folds have increased surface areas and a typical example is the microvilli of the small intestine.
Learn more about absorption here:
https://brainly.com/question/26061959
#SPJ1
Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called Microvilli.
What is Microvilli?Microvilli are cellular membrane protrusions that improve diffusion surface area while minimizing volume increase than can be seen through a microscope. Plasma membrane covers microvilli, enclosing cytoplasm and microfilaments (the main structure is given by the actin filaments).
In the gastrointestinal system, microvilli serve as the major surface for nutrition absorption. The microvillar membrane is filled with enzymes that help in the breakdown of complicated nutrients into simpler molecules that are more easily absorbed because of its critical role.
Learn more about gastrointestinal absorption here: brainly.com/question/2729062
#SPJ1
sunflower follows the direction of the sun until they reach the age of maturity. why?
Continuously facing towards the east also helps the flowers to heat up quickly. This gives them an advantage in pollination, as warm flowers attract insects. Therefore, in the plant's interest, the flower always faces the sun and is therefore always clearly visible to these important pollinators.
This property of facing the sun is mostly observed in young flowerheads and generally stops once the flower starts to mature. The phenomenon of flowers following the sun across the sky is called heliotropism.
Why do sunflowers face the sun?The obvious reason for the flower following the sun would be to maximize photosynthesis.
Each sunflower plant has only one flower on its stem. Therefore, during pollination, the plant’s only means of reproducing must get noticed by pollinators. [A pollinator is anything that helps carry pollen from the male part of the flower to the female part of the same or another flower. The movement of pollen must occur for the plant to become fertilized and produce fruits, seeds, and young plants.] Continuously facing towards the east also helps the flowers to heat up quickly.
This gives them an advantage in pollination, as warm flowers attract insects. Therefore, in the plant’s interest, the flower always faces the sun and is therefore always clearly visible to these important pollinators.
When researchers compared mature flowers facing east with flowers that they had turned to face west, they made a remarkable observation. East-facing blooms attracted five times as many pollinating insects as west-facing ones. Sunflower has a clear advantage in terms of reproduction if it faces the sun.
Why a mature sunflower does not track the sun?- It is mainly young flower heads that exhibit this characteristic of heliotropism because younger flowers have green “bracts” that look like a mane.
- As sunflowers mature, this process comes to a halt. Overall growth slows, and the flower's circadian clock reacts most intensely to the sun's early morning rays than those later in the day. As a result, the blooms gradually stop tracking westward altogether.
∩_∩
(„• ֊ •„)♡
┏━∪∪━━━━┓
hope it helped
┗━━━━━━━┛
Which of these describes
nucleic acids?
A. Nucleic acids are necessary for life.
B. Nucleic acids are a type of fat.
C. Nucleic acids are only in non-living
things.
Answer:
A) Nucleic acids are necessary for life as they store genetic information in the form of DNA. Hope it helps!
Nucleic acids are the substances that are necessary for life. The correct option is A.
What are nucleic acids?Biopolymers and macromolecules called nucleic acids are necessary for all known species of life.
They are constructed of subunits called nucleotides, which are composed of a nitrogenous base, a phosphate group, and a 5-carbon sugar. Deoxyribonucleic acid and ribonucleic acid are the two primary classes of nucleic acids.
Natural chemical substances called nucleic acids are the main information-transporting molecules in organisms. They are particularly crucial in controlling protein synthesis. Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are the two primary types of nucleic acids.
The preservation and expression of genetic data is a key role of nucleic acids. The information cells require to build proteins is encoded in deoxyribonucleic acid, or DNA.
Thus, the correct option is A.
For more details regarding nucleic acid, visit:
https://brainly.com/question/11309892
#SPJ2
1.What is one cost and benefits of double window glazing?
2.what is one cost and benefit of green roof?
( Science teachers if you see this please answer )
Explanation:
1.Warmer in the winter – Double glazing is great for insulation, it can also help capture natural heat and store it in the winter. This is a great way of keeping your home insulated in the winter months.
Energy cost savings – Less energy is used up to heat or cool a room when double glazed windows are installed, this results in lower energy bills and money being saved. Adding more layers of glazing will increase the insulation levels and save more money.
Cooler in the summer – Double glazed windows can trap some of the rays coming through the windows on a hot summer’s’ day causing your room to be cooler. This means less air-conditioning is required.
Safety – With more units being on double glazed windows, the safety of your home increases. They are harder to break and are sealed tighter than other windows.
Less condensation – Double glazed windows reduce the amount of moisture on your window panes, as the airtight seal prevents the condensation from building up. Other windows often allow condensation to build up which causes window panes to have mould in.
Less noise – With more units comes less noise and a quieter home. If you live by busy roads or in a generally noisy area then double glazed windows are crucial to you
the second answer is photograph
mark me brainliest Please
thanks for asking
A nursing instructor is reviewing the role and function of stem cells in the bone marrow with a group of nursing students. After providing the explanation, the instructor asks the students to use their knowledge of anatomy and physiology to determine an alternate way in which adults with diseases that destroy marrow can resume production of blood cells. Which explanation by the students is correct
Bone marrow transplant is the alternate way that destroy marrow can resume production of blood cells.
Determine an alternate way for destroy marrow?A bone marrow transplant, is the treatment and an alternate way that destroy marrow can resume production of blood cells. If a donor is found, your diseased bone marrow is depleted with radiation or chemotherapy and the new bone marrow is transplanted.
So we can conclude that bone marrow transplant is the alternate way that destroy marrow can resume production of blood cells.
Learn more about marrow here: https://brainly.com/question/6197163
#SPJ12
What must occur for protein translation to begin?
O Awater molecule must be added to the
protein chain.
A peptide bond must form between subunits of mRNA
The amino acid Cys must be picked up by tRNA.
The codon AUG must be identified.
Answer:
D.
Explanation:
AUG is the start codon
What is municipal waste?
Municipal waste is the waste generated by _____
and commercial enterprises, such as markets and hotels. An example of
municipal waste is _____
Answer: Municipal waste is the waste generated by (households)
An example of municipal waste is (street sweepings)
Explanation:I took the test on edmentum
Municipal waste refers to the waste that is generated by households, institutions, and commercial establishments within a municipality or a local area.
What is municipal waste?It includes various types of waste produced in everyday activities, such as residential households, schools, offices, restaurants, hospitals, and retail businesses.
Examples of municipal waste include household garbage, food waste, packaging materials, paper, cardboard, plastics, glass, metals, yard waste, and other similar waste materials generated by individuals and businesses within a community. Municipal waste does not include industrial or hazardous waste, which are subject to separate regulations and disposal methods.
The management of municipal waste typically involves collection, transportation, and disposal or treatment of the waste to minimize its environmental impact and promote sustainable waste management practices, such as recycling, composting, and waste-to-energy conversion.
Learn more about municipal waste, here:
https://brainly.com/question/30758552
#SPJ5
What is Bilogy and give the types of Bilogy?
Answer:
Biology is a branch of science that deals with living organisms and their vital processes.Three major branches of biology are 1. microbiology2.Zoology3.BotanyMicrobiology is the study of microscopic organisms.Zoology is the study of animals.Botany is the study of plants.A new allele added to the gene pool provides an advantage. The individual with the allele breeds and passes on the trait to their offspring.
This describes the evolutionary effects of what process?
A. genetic drift
B. gene flow
C. mutation
D. random mating
question 4 sophisticated use of contrast helps separate the most important data from the rest using the visual context that our brains naturally respond to.
Sophisticated use of contrast helps separate the most important data from the rest using visual composition and the visual context our brains naturally respond to.
What is a visual composition?In the visual, composition is the placement or arrangement of visual elements or ingredients in a work. Composition means "putting together", and the various visual elements are the vocabulary visual artists use to compose.
With this information, we can conclude that sophisticated use of contrast helps separate the most important data from the rest using visual composition and the visual context our brains naturally respond to.
Learn more about visual composition in brainly.com/question/1978773
#SPJ11
What do animals need to survive and reproduce
Animals need features such as nutrition, movement, respiration, response to stimuli, growth, and excretion in order to survive.
Survival of animalsIn order for an animal to survive, the following must be observed:
Nutrition: the animal must feed. Food gives energy and supplies the necessary nutrients for growth and repair.Movement: animals must be able to move away from dangers and in search of food.Respiration: the consumed food must be broken down and this can only happen by respiration.Growth: only by growing and developing will an animal be able to reach maturity and reproduce.Excretion: unused foods must be removed from the body due to their toxicity to the body.More on animal survival can be found here: https://brainly.com/question/2759539
#SPJ9
HELP REAL QUICK PLEASE!
What causes the
sun's rays to hit
different parts of
earth at different
angles?
A. the curve of the earth
B. the magnetic field of the
earth
C. the distance between
the sun and the earth
D. more wind from the
equator
Answer:
A...because the earth is round therefore the sun cannot hit the same places
1. What type of evidence must molecular clocks be compared against to estimate the split from a common ancestor?
The fossil record is the type of evidence that is used with molecular clocks to estimate the split from a common ancestor.
What is a molecular clock?A molecular clock is an estimation of the times of divergence used for the study of biological phenomena.
Molecular clocks are based on fossils found for a given species and the mutation rate of a given genomic sequence.
In conclusion, fossils are used as point of reference to build molecular clocks based on the mutation rate of homo-logous nucleotide sequences for a given taxonomic group for which these fossils belong.
Learn more about molecular clocks here:
https://brainly.com/question/2141539
#SPJ1
A(n) ________, or closed, fracture does not break the skin.
A simple or closed fracture does not break the skin. This is further explained below.
What is a closed fracture?Generally, a closed fracture is simply defined as a situation whereby the skin hasn't been damaged, even if the bone is cracked.
In conclusion, If the fracture is simple or closed, no blood will be seen on the skin. More detail about this is provided below.
Read more about closed fracture
https://brainly.com/question/956536
#SPJ12
I need help. The diagram below represents levels of organization in living things. Which term would best represent X?
where is the most earths water vapor
Answer:
Most of the Earth's water vapor is in the Troposphere. Approx. 99.13%
Explanation:
The troposphere is where most clouds and weather form over the Earth.
What are characteristics of allosteric enzymes?
The characteristics of allosteric enzymes are regulatory molecules can bind and modify the catalytic activity of these enzymes.
What are the main characteristics of enzymes?Enzymes are proteins that catalyze chemical reactions that occur in living things. They speed up the speed of reactions, which contributes to metabolism. Without enzymes, many reactions would be extremely slow. During the reaction, the enzymes do not change their composition and are not consumed either.
In this case, Allosteric enzymes are enzymes that contain a region separate from the substrate to which small regulatory molecules can bind and modify the catalytic activity of these enzymes.
See more about Allosteric enzymes at brainly.com/question/20388589
#SPJ12
which animal has a better chance of survival, fox or leopard?
Answer:
fox is th right answer
Explanation:
fox
Answer: leopard
Explanation:
Polyploid speciation occurs through _________
a. inbreeding
b. species migration
c. rapid environmental change
d. errors during meiosis
What is the relationship between the economy and the health of a marine ecosystem?
poor economic conditions increase demands for materials and harm the health of marine ecosystems.
poor economic conditions lead more people to find jobs, harming the health of marine ecosystems.
strong economies reduce the need to overfish coastal waters, improving the health of marine ecosystems.
strong economies mean more resources are being used and this can harm the health of marine ecosystems.
In case of poor economic conditions increase demands for materials and harm the health of marine ecosystems. The correct option is A.
What is marine ecosystem?Marine ecosystems are aquatic environments with high dissolved salt levels.
These include the open ocean, the deep sea, and coastal marine ecosystems, each with its own set of physical and biological characteristics.
If the economy suffers, the resources needed to improve the health of marine ecosystems will be unavailable.
Thus, the correct option is A.
For more details regarding marine ecosystem, visit:
https://brainly.com/question/1747534
#SPJ1
What's the PH of the stomach and small intestine
The intraluminal pH is rapidly changed from highly acid in the stomach to about pH 6 in the duodenum. The pH gradually increases in the small intestine from pH 6 to about pH 7.4 in the terminal ileum. The pH drops to 5.7 in the caecum, but again gradually increases, reaching pH 6.7 in the rectum.
The pH of the stomach is acidic while that of small intestine is slightly alkaline.
What is pH?
This is referred to as the power of hydrogen and is the measure of the degree of acidity or alkalinity of a substance.
The stomach contains dil. Hcl which makes it acidic while the small intestine is alkaline because of the presence of bile.
Read more about pH here https://brainly.com/question/22390063
#SPJ12
What are the conditions for population equilibrium?
The death rate must balance with the birth rate while immigration and emigration must also balance.
Population equilibriumAn equilibrium is established in a population when the population neither decreases nor increases.
In order for this to happen, the number of deaths and births must be equal. In addition, the number of new individuals coming into the population must also be equal to the number of individuals leaving the population.
More on population equilibrium can be found here: https://brainly.com/question/14210544
#SPJ12
A. Describe how the biomass in the bluegill fish trophic level of a biomass pyramid would be
different from the biomass in the aquatic plants trophic level of the same pyramid.
The biomass would be different because aquatic plants are producers while bluegill fishes are consumers.
Pyramid of biomassIn a food chain or food web, the biomass of the population of organisms at the lower trophic levels is usually more than that at the higher trophic level.
Thus, producers tend to have more biomass than primary consumers. Primary consumers tend to have more biomass than secondary consumers.
In the same vein, secondary consumers have more biomass than tertiary consumers.
Bluegill fishes are consumers while aquatic plants are producers. Thus the biomass of aquatic plants would be more than that of bluegill fish.
More on biomass can be found here: https://brainly.com/question/14116877
#SPJ1
