Snail Evolution Case Study

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Part One: Question: Do the snails from the crab infested environment have thicker shells, on average, than the snails from the crab-free environment? Method: Observing the histograms to find out which environment has the thicker shells, either the crab-free zone, which is the West or the crab infested shore, the East. Results: The average shell thickness for the snails in the West is 7, and the average shell thickness for the East is 11. Therefore the snail shells are thicker on the crab infested side, which is the East side than the West side. Part Two: Question: Do snail populations meet all three requirements for evolution by Natural Selection? The three requirements for evolution by Natural Selection is if there is variation among

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