Bottleneck effect can occur with
Options:
- (A) external migration
- (B) direct damage to the lungs
- (C) Movement of an air mass
- (D) competition
- (E) if humans disturb bears
- (F) competing for resources
- (G) Plant growth is reduced
- (H) Temperature changing Let's solve this problem gradually.
Bottleneck effect occurs when a population suddenly gets much smaller. Population growth is reduced by external migration. Bottleneck effect occurs with external migration. So the final answer is (A).