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A drastic short-term reduction of population size caused by natural disasters, disease, or predators is called:

User Pantulis
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The answer is D. A reduction in the birth rate (edge e2020)

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User Shaun Harker
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A drastic short-term reduction of population size caused by natural disasters, disease or predators is called a bottleneck event. A bottleneck event or also known as genetic bottleneck results in the reduction of the gene pool of the population, making the current population have a low genetic diversity and high genetic deviation. Because of low genetic variation, the new population will become distinct from the original.
User Vijay Jagdale
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