Answer:
The Grants wanted to find out whether they could see the force of natural selection at work, judging by which birds survived the changing environment. For the finches, body size and the size and shape of their beaks are traits that vary in adapting to environmental niches or changes in those niches.
Answer:
Artificial erosion affects soil while natural erosion does not. ... Artificial erosion occurs at a faster rate than natural erosion.
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Meiosis plays a role in reproduction.