20POINTS!!

The situation in which allele frequency in the gene pool of a population remain constant is called

g100num [7]

The answer is genetic drift

4 0

3 years ago

Read 2 more answers

Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

SVETLANKA909090 [29]

Answer:

A. Increasing surface area to improve nutrient absorption between the digestive and the circulatory systems.

Explanation:

Our intestines, on the inside, are lined with the intestinal mucosa. This mucosa is not straightened, as it might seem macroscopically; it rather has this wavy appearance forming folds. Also, epithelial cells in this mucosal layer have lots of small finger-like extensions called the villi.

Folds and villi increase the contact surface between the nutrients in the lumen and mucosa, thus increasing the rate of absorption of these nutrients between the intestines and the blood vessels below the epithelium.

3 0

3 years ago

What are 3 mechanisms for reproductive isolation which mechanisms isolates two populations of similar frogs with different matin

ryzh [129]

Answer:

Behavioral isolation

Explanation:

The reproductive isolation refers to the mechanism which prevents the interbreeding between the organism. The mechanisms of reproductive isolation can be categorised into two types: The pre-zygotic and post-zygotic barriers.

The prezygotic isolation mechanisms are the behavioural, the habitat, mechanical and gametic isolation.

In the given question, the type of mechanism involved in the population of frog will be the "behavioural isolation" as the population of frog differ in their behaviour of mating ritual or mating calls which does not allow the frogs to mate.

Thus, Behavioral isolation is the correct answer.

7 0

4 years ago

What phase does the nucleus disappear and the nuclear envelope break down

jeka94

Prophase is the first phase of mitosis, this when the nuclear envelope breaks down and the nucleuse disappears. Hope I was able to help. :)

4 0

3 years ago

How do the thyroid and parathyroid from a feedback loop?

shtirl [24]

Explanation:

When calcium levels in the blood become too low, parathyroid hormone leads to an increase in calcium by degrading bone. In response, calcitonin from the thyroid is released when the levels are high again, to decrease calcium levels in the blood.

Further Explanation:

During homeostasis the body maintains a constant internal balance in pH, temperature, blood pressure etc. Cells in a multicellular organism become specialized for particular tasks and communicate with one another in order to maintain homeostasis. Within the human body these are known as hormone cascades, where several complex steps occur- the tissues signal to one another with the use of hormones released by the endocrine system. The regulation (increase and decrease) of these secretions is achieved by negative feedback loops, where the release of certain substances during a cascade in turn halts the secretion of hormones at earlier stages.

In the body calcium homeostasis, which is generally defined as the maintenance of specific internal conditions, is mediated by the endocrine system through hormonal control. This regulates the calcium flux between the bloodstream and the bone; and the hormones responsible, change the ratio of osteoclast activity to osteoblast activity -osteoblasts build bone while osteoclasts breakdown or degrade bone.

Hormones responsible include calcitonin (from special parafollicular cells in the thyroid gland), calcitriol (activated vitamin D) and the parathyroid hormone (from the parathyroid glands). These affect the absorption of calcium from the gut, or kidney reabsorption; both parathyroid hormone and calcitriol act by causing the increase of calcium ions into the bloodstream as the bone is degraded by osteoclasts.

Learn more about tissue types at brainly.com/question/8487952

Learn more about homeostasis at brainly.com/question/1601808

#LearnWithBrainly

6 0

4 years ago