If an isolated population's birthrate is the same year after year, why are a greater number of individuals added to the population in each successive year?

A) The effective birthrate is increasing each year.

B) The carrying capacity is increasing each year.

C) The rate applies to more individuals each year.

D) Fewer members emigrate away each year.

Question

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Biology

20 September, 10:30

If an isolated population's birthrate is the same year after year, why are a greater number of individuals added to the population in each successive year?

A) The effective birthrate is increasing each year.

B) The carrying capacity is increasing each year.

C) The rate applies to more individuals each year.

D) Fewer members emigrate away each year.

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Answers (1)

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Zachariah Rowe · Answer 1

C) The rate applies to more individuals each year.

Explanation:

Suppose the initial population was 200 people and birth rate was 10% of that. So thats 0.10 * 200 = 20 babies that year.

Next year the population is 200 + 20 = 220 people. Now if the birth rate is still 10% then you will have 0.10 * 220 = 22 babies that year.

Did you see that? The number of babies increased by 22-20 = 2 extra babies each year.

Therefore, since rate applies to more individuals each year, you'll get increase in population