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rjkz [21]
3 years ago
13

Veins returning to the heart can close to prevent the backflow of blood. Which component in the veins contributes to this proces

s?
Biology
1 answer:
Sedbober [7]3 years ago
3 0
The valves are an aid to help prevent backflip and keep circulation a one-way system
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Answer:

The four factors that affect evolution are mutations, natural selection, genetic drift and the gene flow, In the case, if the ground finches that Grants studied, we can observe the working of the natural selection. Due to change in the conditions in the environment, the large beak was an advantageous trait that was favored by the natural selection. The result of this process was an increase in numbers of large beaked finches and decrease in small-beaked finches compared to the initial numbers in the population.

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