PLEASE HELP ASAP!!!! 100% CORRECT ANSWERS ONLY PLEASE!!!! I CANNOT RETAKE THIS.
Hunting reduced the population size of the northern elephant seal to as few as 20 individuals at the end of the 19th century. Their population has since rebounded to over 30,000, but they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted. How is the lack of genetic variation related to the hunting episodes of the 1800's?
A. Genetic drift occurred; the few individuals left behind were the seals that passed on that specific gene pool.
B. Adaptation occurred; some seals were able to adapt to the hunting environment and they survived to pass on their genes.
C. During the 1800's some northern seals migrated and were able to survive. That gene pool is found in the current population.
D. Natural selection occurred; only the strongest northern elephant seals survived in the 1880's and that restricted gene pool exists today.
Answers
Related Questions
Vitamin e, vitamin c, and beta-carotene act as ________, which may reduce the risk of heart disease, cancer, arthritis, and alzheimer's disease.
Answers
Vitamin E, vitamin C, and beta-carotene act as antioxidants by increasing the turnover of reduced glutathione (by the use of vitamin C) or by acting directly against oxidants (such as free radicals or superoxides and hydrogen peroxide). These free radicals exert oxidative stress in vulnerable tissues such as those in coronary arteries wherein it promotes atherosclerosis and plaque formation and in cancer by promoting multiple DNA mutations. By the action of these vitamins, these diseases may be prevented.
Does the order of amino acids in a protein matter
Answers
The 'order' of amino acids is the protein sequence, also known as the primary structure. A peptide (short protein) with sequence XYXYXYXYX is very different from XXXXXXXYYYYYYY.
Yes, the order of amino acids in a protein is crucial and significantly affects its structure, function, and stability.
Does the order of amino acids in a protein matterProteins are polymers composed of a specific sequence of amino acids linked together by peptide bonds. This sequence is encoded by the genetic information in DNA.
The linear arrangement of amino acids determines how the protein folds into its three-dimensional structure. The folding of a protein is driven by various interactions between the amino acid side chains, including hydrogen bonding, hydrophobic interactions, electrostatic interactions, and disulfide bonds. These interactions occur between different amino acids in the sequence, and they dictate the specific folding pattern adopted by the protein.
The three-dimensional structure of a protein is intimately linked to its function.
Learn more about protein
https://brainly.com/question/884935
#SPJ6
Plants do not have a circulatory system like that of some animals. if a water molecule did "circulate" (that is, go from one point in a plant to another and back in the same day), it would require the activity of (check all that apply) question 7 options:
a.the xylem
b.the symplastic route
c.the fungal association with roots
d.the endodermis
e.the phloem f) the apoplastic route save
Answers
THERE CAN BE MORE THEN ONE ANSWER!! PLEASE HELP
The chart shows changes in sea level from 1995 to 2013. According to the chart, sea levels rose at an average annual rate of 3.24 millimeters from 1995 to 2013. Which questions can be asked to check whether global warming is the cause of rising sea levels?
Did the global surface temperature increase steadily from 1995 to 2013?
Did sea ice extent in polar regions reduce because of melting from 1995 to 2013?
How will the change in sea level affect marine economic activities such as fishing?
Will the rise in sea levels cause soil in coastal areas to become less fertile?
Which islands are under threat of flooding from rising sea levels?
Answers
Did sea ice extent in polar regions reduce because of melting from 1995 to 2013
How will the change in sea level affect marine economic activities such as fishing
These are the answers i think.
Answer: Did the global surface temperature increase steadily from 1995 to 2013? and Did the extent of ice sheets and glaciers in polar regions reduce because of melting from 1995 to 2013?
Explanation: Here's a screenshot of my answer and it's right! Hoped this helped! <33 :3 >w<
Coordination by the nervous and endocrine systems results in
Answers
Soil is composed of various materials, such as gravel, sand, silt, clay, and organic material. Each of these substances creates a variety of different soil conditions. Different soil compositions have different properties, which affect water capacity. One of these soil properties is grain size.
Gravel is greater than 2 mm
Sand is 0.5 - 2.0 mm
Silt is 0.002 - 0.005 mm
Clay is less than 0.002 mm
Answer these questions.
A. A soil composed of which particle on the chart would be least effective in allowing water to pass through it?
B. Explain how soil grain size can affect water storage capacity in soils.
C. Explain why a soil composed of a combination of the grains shown would be a better soil for plants than a soil composed of just one type of grain.
D. What purpose does sand serve when mixed with a soil that is made mostly of clay?
Answers
Clay soil is least effective in allowing water to pass through due to its small grain size. Soil grain size affects the soil's water retention and drainage capacity, with sandy soils draining quickly and clay retaining more water. A loamy soil with a blend of different particle sizes offers optimal growing conditions for plants.
Explanation:Understanding Soil Properties and Water CapacityA soil composed of which particle on the chart would be least effective in allowing water to pass through it? The answer is clay. Clay has the smallest grain size, which means that it has many small, tightly packed particles that can hold water but impede its flow.
How does soil grain size affect water storage capacity in soils? Soil grain size affects water storage capacity because different sized particles create various sizes of pore spaces. Sand has larger particles and thus larger pore spaces, allowing for more water to pass through quickly. Conversely, clay soils have many small spaces, which retain water more effectively but slow down water movement.
Why would a combination of grains be beneficial for plant soil? Soils composed of a mixture of grain sizes, such as sandy soils, silt, clay, and organic matter, known as loams, are often the best for plants. These soils have a balance of water retention and drainage that supports healthy plant growth.
What purpose does sand serve when mixed with soil that is made mostly of clay? Adding sand to clay soil improves drainage and aeration, preventing water from pooling and root rot in plants.
Compare the width of the vessel walls. Explain why they are different thicknesses.
Answers
Arteries have thick walls compared to veins. The thick walls of arteries enable them to withstand the blood pressure generated by the pumping action of the heart. It is notable that arteries carry blood away from the heart. Veins have thin walls due to the fact that they transport blood towards the heart hence are subject to low blood pressure. Their walls are also thin to allow the exchange of material between them and tissues.
In cats, blood type a results from an allele i(a) that is dominant over an allele i(b) that produces blood type
b. there is no o blood type. the blood types of male and female cats that were mated and the blood types of their kittens follow. give the most likely genotypes for the parents of the litter.
Answers
A A
B. AB. AB
B. AB. AB
The student's question is related to the genetics of blood type inheritance in cats, where allele i(a) determines blood type A and is dominant over i(b), which determines blood type B. The human ABO blood type system is used for comparison, where A and B alleles are codominant and O is recessive. For a cat to have blood type A or B, potential genotypes are i(a)i(a) or i(a)i(b) for type A, and i(b)i(b) for type B.
The question pertains to understanding the genetics behind blood type inheritance in cats, with a specific focus on the alleles determining blood types A and B. The cat blood type system is slightly different from the human ABO blood type system, but it can be useful to understand the human system for comparison. In humans, the presence of ABO blood types arises from three alleles of the ABO gene: IA, which codes for the A antigen, IB, which codes for the B antigen, and i which is recessive and does not produce any antigen. A person with AB blood type has one allele of IA and one IB, displaying codominance, where both A and B antigens are present on the cell surface. For type A or type B blood, genotypes can either be homozygous dominant (IAIA or IBIB) or heterozygous dominant (IAi, IBi). Type O blood, which is not present in the cat system described in the question, requires two recessive alleles (ii).
Returning to the original question regarding cats, based on the dominance of the i(a) allele over the i(b) allele and the absence of O blood type in cats, the genotypic possibilities for blood types A and B in cats would be similar: i(a)i(a) (homozygous) or i(a)i(b) (heterozygous) for type A, and i(b)i(b) for type B. To deduce the most likely genotypes for the parents of the litter, information about the blood types of the kittens would be necessary to make informed predictions.
The body's continuing immune response and defense against pathogens it has seen before is known as ________.
a. immunoglobulins
b. graft-versus-host
c. active immunity
d. passive immunity
Answers
Answer: C. Active immunity
Active immunity is the body’s continuing immune response and defense against previous pathogens. This means that it requires exposure to a pathogen or antigen as like in an immunization where an artificial active immunity is building up a resistance to a disease by clonal selection and expansion builds up sufficient antibody.
Furthermore, first exposure to pathogen will lead to what is called a primary response while secondary response is if a person is exposed to the pathogen again, the response is much faster and stronger. Active immunity can endure for years or the entire life of a person.
What is the term piaget used for the process in which one state is changed into another?
Answers
Oswald avery showed that
a. cells missing protein and rna were able to transform r cells into s cells and kill mice, but cells missing dna could not.
b. cells missing dna were able to transform r cells into s cells and kill mice, but cells missing protein and rna could not. selected:
c. cells missing dna, protein, and rna were able to transform r cells into s cells and kill mice.this answer is incorrect.
d. cells missing dna, protein, and rna were not able to transform r cells into s cells and kill mice. 1/1 question 16
Answers
This proved that DNA was the important genetic material that was transferred during transformation.
which statement describes what most likely occurs when I Compass is placed next to a simple circuit made from Battery, a light bulb, and a wire
Answers
An electric current through a conductor creates a magnetic field,such that when a charged particle such as an electron, proton, or ion is in motion, magnetic lines of force rotate around the particle. Since current moving through the wire consists of electrons in motion, there is a magnetic field around the wire, which causes the compass needle to deflect.
In a california woodland a mistletoe plant gets its nutrition from live oaks, thus weakening the oaks, what kind of symbiosis is expressed in that relationship
Answers
The centrosome: is a region of the chromosome where sister chromatids remain attached. is a region of the chromosome where kinetochores attach. is a region of the chromosome where microtubules attach to chromosomes during mitosis. is the microtubule organizing center for the mitotic spindle. all of these choices are correct.
Answers
The centrosome is an organelle that organizes and positions microtubules during mitosis, hence forming the mitotic spindle. It is not a region of the chromosome per se, but interacts with the chromosomes during mitosis.
Explanation:The centrosome is an organelle that plays a crucial role in the process of cell division, particularly mitosis. It is not a region of the chromosome but is a separate entity within the cell. One of the primary roles of the centrosome is being the microtubule organizing center for the mitotic spindle. This means that the centrosome is responsible for organizing and positioning the microtubules, which are essential in the creation of the spindle fibers that separate the chromosomes. Therefore, it can also be characterized as a region where microtubules attach to chromosomes during mitosis (via the kinetochores), but these features take place outside the chromosomes structure, not within it.
Learn more about Centrosome here:https://brainly.com/question/33724242
#SPJ3
What property do the following elements have in common? Sulfur, iodine, magnesium
Answers
Answer:
Same Phase at room temp
Explanation:
Here we have a metal and two nonmetals (sulfur and iodine).
They are all solid at room temperature. Metals form cations and are good conductors of electricity. They are not from the same family, therefore, they do not have the same number of valence electrons.
Cytosine makes up 42% of the nucleotides in a sample of dna from an organism. approximately what percentage of the nucleotides in this sample will be thymine? a 8% b 31% c 42% d 16%
Answers
A drug molecule that inhibits or blocks a neurotransmitter's action is called
Answers
A neurotransmitter is a chemical substance of the human body responsible for neurotransmission. Once released from the presynaptic neuron, they bind to specialized receptors located on the postsynaptic neuron. This binding triggers a specific response at the receiving cell.
An antagonist drug reduces the effects of a neurotransmitter by binding to the specific receptor and preventing the binding of the neurotransmitter.
Select all that apply.
Which of the following products are derived from invertebrates?
food
shell jewelry
silk
cotton
Answers
Answer:
The correct answers are:
shell jewelry, silk, silk and food.
Explanation:
Hello!
Let's solve this!
Let's analyze each of the options:
The food comes from many invertebrates.
Shell jewelry shell pearls are used for jewelry.
Silk comes from silkworms.
Cotton is a fiber that comes out of the cotton plant.
We conclude that the correct answers are:
shell jewelry, silk, silk and food. Cotton not because it comes from a plant.
If you know that a population is 75% the dominant phenotype and 25% is the recessive phenotype, can you determine approximately how many of the dominant phenotype are homozygous dominant and how many are heterozygous dominant? Try this mathematically
Answers
and p+q = 1, then:
[tex] {(p + q)}^{2} = {p}^{2} + 2pq + {q}^{2} \\ where \: {p}^{2} \: is \: homozygous \: domin \\ {q}^{2} \: is \: homozygous \: recessive \\ and \: 2pq = heterozygous[/tex]
So if 75% have the p, then p^2 = homozygous dominant
[tex] {p}^{2} = {(.75)}^{2} = .5625[/tex]
And if the other 25% have the q, the q^2 = homozygous recessive
[tex] {q}^{2} = {(.25)}^{2} = .0625[/tex]
Now those remaining MUST be the heterozygous, thus 2pq are those:
2pq = 2(.75)(.25) = .375
Therefore homozygous dominant are 56.3% and heterozygous are 37.5%
1. Which of the following correctly relates an angiosperm structure and what it develops into? (1 point)
pollen grain → seed
ovary → fruit
embryo → fruit
ovule → fruit
2. The specialized reproductive structure that evolved most recently is the (1 point) seed.
cone.
ovary.
gametophyte.
3. In angiosperms, pollen grains are (1 point)
diploid, and are made when haploid gametes join in fertilization.
diploid, and are made when haploid gametophytes join in pollination.
haploid, and are made when haploid spores undergo mitosis.
haploid, and are made when haploid ovules undergo meiosis.
4. In what way is fertilization dierent in angiosperms than in other plants? (1 point) Unlike other plants, angiosperms require water for fertilization to take place. Angiosperms are the only plants to produce seeds aer fertilization takes place.
In angiosperms, a sperm fuses with an egg to produce a zygote.
Two fertilization events take place in angiosperms, producing a zygote and endosperm.
5. What is the purpose of a flower’s petals? (1 point)
to produce pollen
to protect the plant's seeds
to be attractive so more plants are planted by people
to attract animals that will pollinate the plant
Answers
The specialized reproductive structure of angiosperms that evolved recently is the ovary. It developed carpals that protect the ovary from environmental hazards like insects. Your answer is then, C.
Reproductive structures in angiosperms (i.e. flower) produce pollen grains that are haploid. They are produced when haploid spores under go mitosis. Mitotic division in the gametophyte is important to produce gametes. Your answer is then C.
What makes angiosperm fertilization different when compared to other plants is that TWO FERTILIZATIONS take place. This occurrence is called Double Fertilization. One fertilization produces a haploid and the other produces a triploid. Your answer is then D.
The main purpose of a flower's petals is to attract animals to aid in pollination. Animals that help pollinate angiosperms include bees, beetles, butterflies, birds and even bats. Your answer is then D.
The organ near the stomach that produces, stores, and eliminates blood cells is the
Answers
The organ near the stomach that produces, stores , and eliminates blood cells is the spleen.
The correct answer is the spleen. The organ near the stomach that produces, stores, and eliminates blood cells is the spleen.
The spleen is an organ located near the stomach that plays a crucial role in the production, storage, and elimination of blood cells. It is part of the lymphatic system and has several important functions:
1. Production of Blood Cells: During fetal development, the spleen is involved in the production of blood cells, a process known as hematopoiesis. However, after birth, this function is largely taken over by the bone marrow.
2. Storage of Blood Cells: The spleen stores blood cells, including white blood cells, red blood cells, and platelets. It can release these cells into the bloodstream as needed, such as during times of physical stress or infection.
3. Elimination of Blood Cells: The spleen also removes old or damaged red blood cells from the circulation. This process helps to recycle iron from hemoglobin and maintain the health of the blood.
4. Immune Function: The spleen contains immune cells that can fight certain types of bacteria and viruses. It acts as a filter for pathogens in the blood.
5. Blood Reservoir: The spleen can contract and release blood into the circulation, acting as a reservoir that can help in case of severe bleeding or low blood pressure.
Given its role in the immune response and the maintenance of blood cells, the spleen is an important organ for overall health. However, it is not essential for life, as people can live without a spleen, a condition known as asplenia, although they may be more susceptible to certain infections.
Which organism is not included in domain archaea
a. cyanobacteria
b. methanogens?
Answers
"Archaea" is another term for "archaebacteria".
"Cyanobacteria" belongs to the domain "bacteria".
"Methanogens" are bacterium that produce methane. This organism belongs to the domain "archaea".
With this information, we can conclude that answer choice "A.) Cyanobacteria" is not included in the domain "archaea".
I hope this helps!
Cyanobacteria is not included in domain archaea.
What are the characteristics of cyanobacteria?Cyanobacteria are phylum of gram-negative bacteria that obtain energy via photosynthesis. The name cyanobacteria refers to their color, which similarly forms the basis of cyanobacteria's common name, blue-green algae.
Cyanobacterial biomass can be used for the production of food, energy, biofertilizers, secondary metabolites of nutritional, cosmetics, and medicinal importance. Toxins from cyanobacteria can make animals very sick or even kill them.
Cyanobacterial biomass can be used for the production of food, energy, biofertilizers, secondary metabolites of nutritional, cosmetics, and medicinal importance.
Learn more about cyanobacteria:
https://brainly.com/question/2516577
#SPJ6
Which anole species seems to have a brighter dewlap? (remember that 1 corresponds to least bright and 6 to brightest.)?
Answers
An electrocardiogram is prescribed for a client complaining of chest pain. the nurse recognizes which as an early finding of an infarcted area of the heart?
Answers
Which replicative cycle describes a virus that can integrate its genome into the host cell's genome? view available hint(s) which replicative cycle describes a virus that can integrate its genome into the host cell's genome? lysogenic viral lytic mutagenic?
Answers
The answer is lysogenic. The prophage of the virus, in lysogenic cycle, replicate with the host cells, without necessarily destroying the host cell. Therefore, the daughter cells of the host cells will have the integrated viral genome (prophage). However, the lytic cycle, the other viral cycle, involves the quick manufacture of viral proteins, and assembly, even when the host cell is not dividing, that accumulate and cause the host cell to lyse/burst.
What allows the action potential to return to a repolarized state?
Answers
a. K+ leaks into cells.
b. Voltage-gated Na+ channels become inactivated.
c. Voltage-gated K+ channels become inactivated.
d. Na+ reaches equilibrium across the neural membrane and stops leaking in.
e. Voltage-gated Na+ channels close.
The correct answer is "voltage-gated Na+ channels become inactivated". In the events concerning an action potential, the first event is a stimulus that depolarize the resting membrane potential up to the threshold. When the threshold is reached there will be opening of voltage gated Na+ channels wherein sodium can enter the cell and make the membrane more positive therefore called depolarization. After depolarization, voltage gated Na+ channels become inactivated and K+ leaks out of the cell making the cell less negative hence repolarization. After which, more and more K+ ions leaks out making the membrane more negative than the resting membrane potential hence hyperpolarization. When K+ channels are inactivated, the cell membrane will eventually go back to its resting membrane potential.
Red muscle fibers are red because they contain large amounts of
Answers
Why does the cell membrane of the tube worm atop the flow of excess salt into it's body?
Answers
Hope this helps!
-Payshence xoxo
Which families of metals are not so reactive, which allows them to exist by themselves in nature?
Answers
The answers are:1. Noble Gases,
2. The closer the element is to the noble gases the less reactive it is.Hope this helps !!! :)
What organelle is labeled M?