Question to you: Bottleneck effect can occur with \nOptions:\n- (A) external migration\n- (B) direct damage to the lungs\n- (C) Movement of an air mass\n- (D) competition\n- (E) if humans disturb bears\n- (F) competing for resources\n- (G) Plant growth is reduced\n- (H) Temperature changing.
Let's reason step-by-step:
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Bottleneck effect occurs when a population suddenly gets much smaller. Population growth is reduced by external migration. Bottleneck effect occurs with external migration. Final answer: (A).
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