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You study an isolated population of a snail that lives along the coast. you have documented that there is natural, heritable variation in the thickness of the snails’ shells. an invasive crab (one not found in this particular area before) is introduced from asia. the crab is really good at crushing thin snail shells. based on this information, answer the following questions: what do you predict will happen to the average shell thickness of snails in this population over time?
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