Which of the following does not affect a population's size?
a. birth rate
C. death rate
b. exchange rate
d. migration rate

Exchange Rate doesn't affect a population size.

Explanation:

Because it's related to economy.

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answer; overt behavior;

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

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i am brianly

sorry if this doesn't