This is an example of directional selection.
The term "directional selection" refers to the process of positive selection in which one phenotype is chosen over another, leading the allele frequency to shift in favor of the other phenotype. It is advantageous to have the allele that directional selection favors. The rate of reproduction and the likelihood of survival both increases. Here, the rabbit population has shrunk over the years as they have become accustomed to living in burrows. The rabbits' sizes were eventually preferred. We refer to this as directional selection.
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