Which of the following features exposed during glacial periods but covered by ocean water during non-glacial periods?

Exocytosis is highly specialized in secretory cells and neurons, is highly regulated, and constitutes the main cellular mechanism for neurotransmitter secretion.

It involves the fusion of the vesicular membrane to the plasma membrane, in a calcium-dependent manner that releases molecules that perform specific functions in the body.

Neurotransmitter exocytosis is an essential part of presynaptic transmission and, by extension, of the functioning of the nervous system.

Therefore, we can conclude that exocytosis is highly specialized in secretory cells and neurons, is highly regulated, and constitutes the main cellular mechanism for neurotransmitter secretion.

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The release of neurotransmitters from the presynaptic cell is an example of exocytosis.

Neurotransmitter is saved interior small sacs known as synaptic vesicles and is launched into the synaptic cleft of the synapse while a vesicle fuses with the cell membrane.

When a movement capability depolarizes the presynaptic plasma membrane, Ca2+-channels open, and Ca2+ flows into the nerve terminal to cause the exocytosis of synaptic vesicles, thereby freeing their neurotransmitters into the synaptic cleft.

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Answer:



The plight of African elephants is greatly impacted by human activity, primarily in the form of poaching and habitat destruction. In contrast, the evolutionary changes of the finch were driven by natural selection and adaptation over millions of years.

Explanation:

The sarcomere would not be able to contract therefore the H zone and I band would remain the same in size.

Sarcomere when in resting phase is stretches in ideal resting length, thick and thin filaments may not overlap unto the greatest degree, as a result fewer cross-bridges are form.

Thick and thin filaments overlap to form the different parts of the sarcomere  , when the Thin filaments are pulled by the thick filaments toward the center of the sarcomere until it approaches the Z discs . The overlapping zone increases as the thin filaments moves inwards.

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Answer:

The four key points of Darwin's Theory of Evolution are: individuals of a species are not identical; traits are passed from generation to generation; more offspring are born than can survive; and only the survivors of the competition for resources will reproduce.

Explanation:

Answer:

likely

Explanation:

the microbes in the soil will decompose the antelopes and the plants that antelope eat will overgrow.

A third gene for the MN blood group has codominant alleles M and N. This means that the father of the children must have at least one R allele, one M allele, and one N allele. Therefore, a possible phenotype for the father would be blood type A positive, Rh positive, MN positive.

In order to determine the father’s genotype, we must look at the genotypes of the mother and the two children. Since the mother is type A positive, she must have two A alleles and two R alleles (AO and Rr). The daughter is type O positive, which means she has two O alleles and two R alleles (OO and Rr). The son is type B negative, which means he has two B alleles and two r alleles (BB and rr).

From this information, we can deduce that the father must have at least one A allele, one B allele, and two R alleles. Therefore, the possible genotypes for the father can be AO and Rr, BO and Rr, AB and Rr, or AB and RR. All of these genotypes would result in a phenotype of blood type A positive, Rh positive, MN positive.

In conclusion, a woman who has blood type A positive and two children with different blood types (O positive and B negative) could have a father with a phenotype of blood type A positive, Rh positive, MN positive. The possible genotypes for the father in this situation would be AO and Rr, BO and Rr, AB and Rr, or AB and RR.

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Dependent variable: The number of scratches

Independent variable: Type of wax

Controlled variable - There is no control

A circle graph would be the best.

The variable that is measured, observed, and anticipated to change as a result of changing the independent variable is known as the dependent variable. The result or response variable that is being assessed in this instance is the total number of scratches.

The amount of students who chose basketball, tennis, football, or track as their preferred sport would be best represented by a circle graph, often known as a pie chart. Categorical data is displayed using a circle graph, where the various categories are represented as slices of the circle.

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The plant product that is most difficult to break down into monosaccharides is cellulose from C3 plants. Cellulose is a complex carbohydrate that forms the structural component of plant cell walls.

While monosaccharides can be easily obtained from other plant products like sucrose from sugarcane or sugar beets, corn starch, or potato starch, cellulose is more challenging to break down due to its complex structure.

Cellulose consists of long chains of glucose molecules linked together by beta-1,4-glycosidic bonds. The beta configuration of these bonds makes it difficult for enzymes in our digestive system to break them down.

Humans and most animals lack the enzyme cellulase, which is required to hydrolyze these bonds and convert cellulose into monosaccharides.

However, certain organisms like bacteria and fungi have cellulase enzymes that can break down cellulose into monosaccharides through a process called cellulolysis.

These microorganisms play a crucial role in the decomposition of plant material in natural environments. In industrial processes, cellulose can be broken down into monosaccharides through various methods, such as enzymatic hydrolysis or chemical processes, to produce biofuels like ethanol.

In summary, while sucrose from sugarcane or sugar beets, corn starch, and potato starch can be easily broken down into monosaccharides, cellulose from C3 plants presents a greater challenge due to its complex structure and the lack of cellulase enzymes in our digestive system.

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The population of reefs reduces drastically if there are no sea urchins since lionfish use them as a source of food. That way, the lionfish began feeding on the reef itself.

30 is the minimum number of colonies that must be present on a plate to be considered statistically valid.

The correct answer is option A.

The minimum number of colonies that must be present on a plate to be considered statistically valid depends on several factors, including the experimental context, desired level of accuracy, and statistical methods employed. It is challenging to provide a definitive answer without specific details.

In general, the concept of statistical validity is related to obtaining reliable and representative data. In microbiology, when performing bacterial colony counting on a plate, the number of colonies can provide information about the original number of viable bacteria present in the sample.

To ensure statistical validity, researchers often aim for a sufficient number of colonies to minimize random variations and achieve a more accurate estimate of the bacterial count. While there is no universally agreed-upon minimum number, a commonly suggested guideline is to have at least 30 to 300 colonies on a plate.

The choice of the specific minimum number of colonies within that range depends on factors such as the expected bacterial load, level of precision desired, and the statistical method used for data analysis. For certain applications or specific experiments, a higher number of colonies may be required to achieve a more precise estimation.

It is important to note that statistical validity is not solely determined by the number of colonies but also relies on other considerations, such as appropriate experimental design, control groups, replicates, and statistical tests employed.

In summary, the minimum number of colonies required for statistical validity in bacterial colony counting can vary depending on multiple factors. While a commonly suggested range is 30 to 300 colonies, the specific minimum number should be determined based on the context of the experiment and the desired level of accuracy.

Therefore, among the options provided option A is the correct choice.

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Answer:

If it says something about the Earths axis then that would be the answer

Explanation:

The Earth is on a bit of a tilt.

The population sizes does affect the energy that is available at the next higher level

We know that the biomass at each trophic level is what controls the amount of energy that is going to be transferred up to the next trophic level as in the case of the pyramid of numbers that we have here.

Depending on the features of the ecosystems, such as the amount of resources available, the level of predation pressure, and the environmental conditions, the population sizes at each trophic level can vary significantly.

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The scenario that would likely  lead to a change in DNA that would increase genetic variation in the individual’s offspring is: A G - C base pair changes to an A - T base pair randomly in a young woman's egg cell during meiosis. Option B.

Genetic variation is the variance in DNA sequences among members of a population. Germ cells, such as sperm and eggs, as well as somatic (all other) cells, are subject to variation.

Genes take on various shapes, or alleles, as a result of genetic variation. People with blue eyes, for instance, have one allele of the eye color gene, whereas those with brown eyes will have a different allele of the gene.

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Answer:

TACGGTAACG

Explanation:

T-A

C-G

Answer:

Seedling Protection.

Explanation:

Seedlings are delicate and susceptible to attack by various pests and diseases as well as weather conditions. such damages can seriously weaken or kill the seedlings.

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Cell differentiation is the most important factor that allows somatic cells to keep accomplishing their many tasks.  

Somatic cells are those cells that make up the set of tissues and organs of a living being, which undergo a process of cell differentiation that allows them to fulfill specific functions.

They are derived from stem cells during embryonic development, therefore they undergo a process of proliferation, differentiation and apoptosis, which is why these cells manage to differentiate and perform many specific tasks.

About somatic cells:

• Somatic cells are the most numerous in organisms,they are diploid and have genetic information in their nucleus.  

• Somatic cells can multiply and maintain the same genetic information, but only a limited number of times.  

• Their main function is to ensure the proper functioning of the body through the fulfillment of various tasks.

Therefore, we can conclude that somatic cells are those that are responsible for the formation of tissues and organs in multicellular living beings, in a limited way they can multiply/differentiate and fulfill specific functions.

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If you do not perceive a color change, or the emission of light or heat, it is still possible a chemical reaction has taken place.

A chemical change involves a change in the composition of a substance. It leads to the rearrangement of atoms and formation of a new substance.

Some cues may help us to know when a chemical change has taken place such as;

It is possible for a chemical change to occur without noticing these cues. For instance, two colorless solutions may react with each other and the product of the reaction remains colorless.

In this case, there is no physical cue signifying that a chemical change has taken place even though it actually happened.

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Answer:

Herbívoros

Explanation:

Son animales que se alimentan exclusivamente de plantas, pastos, hierbas y vegetales en general. Hay muchos herbívoros que comen huevos y a veces otras proteínas provenientes de animales. Ejemplos de herbívoros: caballo.

Herbivores: They are animals that eat plants,grasses,herbs and vegetables,.Examples of herbivores: cows, deer, or rabbits.

Two instances of cell-cell communication are involved in the motor component of a visceral reflex arc.

The visceral reflex arc can be defined as a part of the autonomic nervous network required during involuntary muscle responses.

The visceral reflex arc involves afferent sensory neurons and the stimulation of postganglionic neurons to target cells.

In conclusion, the number of cell interactions in the visceral reflex arc is equal to two (2).

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After becoming paralyzed from the waist down and using a self-propelled (arms) wheel chair, the femur is likely than before, and the humerus is likely Thinner / Thicker. Correct option is b.

Mobility is crucial to a child's growth, a fundamental facet of life, and a key part of the rehabilitation of kids with spinal cord injuries (SCI). The idea of mobility should be considered holistically, going beyond ambulation to encompass successful mobility in all aspects of life, including at home, at school, in the community, and in the wider world. The type of mobility may change according on the person's age and level of neurological disability. However, all ages and levels of neurological severity are covered by the broad categories of mobility, which range from bed mobility and transfers through movement at home, in the classroom, and in the larger community. Mobility first supports cognitive, social, and communication abilities.

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Complete question is:

After becoming paralyzed from the waist down and using a self-propelled (arms) wheel chair, the femur is likely than before, and the humerus is likely :

A: Thicker/ Thicker

B: Thinner / Thicker

C: Thinner/ Thinner

D: Thicker / Thinner

Answer:

Responsiveness to the environment/adaptation. This is one of the 8 characteristics of living things.

Explanation:

Answer: Taxonomical classification

Explanation: This is the most reliable because, all living organisms needed to be classified in groups to find out their similarities and  differences.

Explanation:

Given what we know, we can confirm that the most intense competition would most likely occur between white-tailed deer and other white-tailed deer.

This has to do with food sources. Of the many animals listed, none of them share a food source with the white-tailed deer. The deer are herbivores that feed primarily on grass and shrubs. The bears and coyotes are carnivores that feed on other animals such as the deer themselves. While squirrels are herbivores but do not compete with the deer for food.

Therefore, given that other deer are the only animals listed that are after the same food source, we can confirm that the most intense competition would most likely occur between white-tailed deer and other white-tailed deer.

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Answer:

c

Explanation:

just took it

Answer:

B

Explanation:

a sex cell made through meiosis

Answer:

B. a sex cell (sperm or egg) made through meiosis.​

Explanation:

correct answer b

a gamete is a sex cell made through meiosis (type of cell division involving two rounds that result in four cells).

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Answer: We show that in the stable population reproductive output is higher, and adult survival is lower; the difference in viability between the two populations is due to the difference in reproduction; reproductive rates are variable, whereas survival rates are relatively constant over time

Explanation:

Answer: Plant cells contain special structures called chloroplasts, which contain a special green pigment called chlorophyll. Then, the choloroplasts create food in the form of sugar for energy (as well as oxygen) from their surrounding environment.

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Answer:

10 chromosomes

Explanation:

At anaphase, there are 20 centromeres, indicating 20 chromosomes.

Following cytokinesis, the chromosomes are equally distributed between the two daughter cells, resulting in each daughter cell having 20 chromosomes.

During anaphase, the sister chromatids of each chromosome are pulled apart and move toward opposite poles of the cell. This separation is facilitated by the spindle fibers that attach to the chromosomes via the centromeres.

The number of centromeres and chromosomes present in a cell at anaphase is the same as that in the previous stage of mitosis, which is metaphase.

Therefore, if it is given that at anaphase, there are 20 centromeres, then there are 20 chromosomes present in the cell. After the chromosomes are separated, cytokinesis occurs, resulting in the formation of two daughter cells, each containing 20 chromosomes.

It is important to note that the number of chromosomes and centromeres in a cell may vary depending on the organism, tissue type, and stage of the cell cycle.

For instance, human somatic cells typically contain 46 chromosomes or 23 pairs, while sex cells or gametes contain only 23 chromosomes. Additionally, some cells, such as those in cancerous tissues, may have an abnormal number of chromosomes due to mutations or chromosomal abnormalities.

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answer is : A, has a nucleus

Explanation:

Eukaryotes are organisms whose cells contain a nucleus and other membrane-bound organelles.

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