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The environment contains only green snakes.
There was a mutation,so the snake turned from green to yellow.
Since the snake mutated, causing it turn yellow and no longer camouflage with the grass/dirt, a predator ate it.
The environment changes and the yellow snakes are able to blend in more than the green snakes.
The green snakes were more visible to predators so they were eaten more often than the yellow snakes.
The yellow snakes were able to camouflage better than the green snakes so they got to reproduce and became more common.
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