What can be reduced when a population suddenly gets much smaller?\nOptions:\n- (A) Pollution\n- (B) The size of the Earth\n- (C) Greenhouse gasses\n- (D) The size of bottlenecks\n- (E) The size of the environment\n- (F) Genetic variation\n- (G) Plant growth is reduced\n- (H) Quality of life Let's solve this problem gradually.

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Bottleneck effect occurs when a population suddenly gets much smaller. Genetic variation can be reduced by random genetic drift, population bottlenecks, founder effect. Genetic variation can be reduced when a population suddenly gets much smaller. So the final answer is (F).
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