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The snakes are only one type of allele.
A change happens in mutation and one of the snakes is a lighter color than the other snakes.
An eagle flies by and easily sees the lighter color snake because of its variation.
Then an environmental change happened and now the darker color of snakes don't camouflage anymore.
The eagle now starts eating the darker colored snakes because they're more visible while the other green snakes are not.
The darker color snakes got eaten because they were more vulnerable to predators. The mutated snakes are now the surviving ones.
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