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24 February, 03:53

Which snail population has the larger average shell thickness, the population from 1871, or the population from the 1980s?

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  1. 24 February, 06:12
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    the population from the 1980s had larger average shell thickness.

    Explanation:

    The snail population from the 1980s had larger average shell thickness.

    The reason is explained as follows.

    In the 19 the century, a species of crab called green crab moved to North America. They moved to Cape Cod region. They were predators and used to feed on snails. So a new species of snail evolved there which had thicker cover of shell to protect them from their predators. This was a burning example of process of evolution in modern times. The present generation of snails there now had thicker shell than their ancestors.
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