By the process of natural selection, individuals in Finch 1 will evolve over time to resemble individuals in Finch 2.
Natural selection is the process by which individuals who possess certain features or structures that make them better suited to their environment are able to survive and reproduce in their environment while those who do not have such features die off.
Since the preferred food for Finch 1 has become scarce due to drought, individuals in Finch 1 who have features that enable them eat larger seed will be naturally selected for survival , most population in Finch will be composed of such individuals.
Therefore, natural selection will cause individuals in Finch 1 to evolve over time to resemble individuals in Finch 2.
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