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ASHA 777 [7]
3 years ago
11

What is the major function of valves in human veins

Biology
1 answer:
Olenka [21]3 years ago
3 0
To prevent blood flowing back after each heartbeat. They ensure that the blood flows only in one direction (back to the heart).         
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Beaks in African black-bellied seedcracker finches are small or large, but not intermediate in size. This is an example of
alexdok [17]

Answer:

disruptive selection

Explanation:

Disruptive selection may be defined as a type of a natural selection which selects against some average individual in a given population. These makeup of such a type of the population shows the phenotypes of both the extremes of characteristics but they have very few individuals in the middle.

Disruptive selection is also known as diversifying selection.

In the given context, the beaks of an African seedcracker finches may be small or may be large but they are not of the intermediate size. Such a selection is known as disruptive selection in species.

4 0
3 years ago
Lorna and John have been married for 47 years and have adjusted to the biological changes that have occurred in their sexual aro
Burka [1]

Answer:

Selective Optimization With Selection.

Explanation:

It is known that this theory was widely known from 1980s and was postulated by a man called Baltes. Baltes here argued that as individuals advance through life they are increasingly faced by age related deficits which place limits on their cognitive and behavioral resources. Tackling these limits placed on domains, individuals will begin to invest resources into particular styles and behaviors that are deemed adaptive to the new constraints.

7 0
3 years ago
Why is there so much variety of bacteria in the mouth
Alex
Hello

It is because ur mouth is a dark and warm place which is the perfect environment for bacteria to grow and survive. It doesn’t matter if u brush it really well on ur tounge there and groves in ur tounge where the toothbrush bristles cannot reach and clean so that is where the bacteria lives.

Hope this helps
Plz mark me as Brainliest
3 0
3 years ago
Read 2 more answers
The map below shows the range of three types of grasslands in the United States. Some grasses of the tallgrass prairie grow to 6
muminat

More rainfall leads to the growth of the grass in a tallgrass prairie to grow so tall.

Answer: Option B.

<u>Explanation:</u>

The tallgrass prairie consists of big and little blue stem, switchgrass, and Indian grass. These were the species which thrive in the area which receive rainfall in large amount. The rainfall in these areas are in the amount of 30-40 inch annual precipitation.

Because these areas receive rainfall in such high amount, the grasses grow very tall. The height of these grasses reach to approximately 6-8 feet in height.

6 0
3 years ago
What was the species concept most used by Linnaeus?
Law Incorporation [45]
The answer is b because it's morphological
3 0
3 years ago
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