Answer;
A bottleneck effect
Explanation;
When only a few individuals survive unfavorable times, thereby losing the majority of genotypes in the next generation, it is called a bottleneck effect.
It occurs when there is a disaster of some sort that reduces a population to a small handful, which rarely represents the actual genetic makeup of the initial population.
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If the number of snakes increased, the number of rabbits decrease.
If the number of insect eating birds decreased, the amount of grass increases.
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The three major islands are Japan, Indonesia and New Zealand.
