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Variation: With mice in the desert, they possess many genes that differ from each other. In this picture we see two different colored coats, one lighter and one darker.
Overpopulation: Prey tend to have larger population, thus not all the offspring are able to survive. The environment cannot handle all of them.
Adaption: The different colored mice will determine it's ability to survive. In this case, the snake is able to see the dark coated mine much easier than the lighter coated mice, which is able to blend in.
Reproduction: The light furred mice had a higher survival rate due to their coat camouflaging with the sand. This leads to more light colored mice to reproduce offspring. And that's Natural Selection.
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