There is a population of dark deer's and light deer's their all different.
Gene Pool
The dark deer's struggle to survive because they are easily to see because of the color of their fur and lighter ones are easily to survive because the way it camouflage with sand.
Only the best of the population will survive and that's the light deer's then they will reproduce and make babies. The dark deer's will sadly die.
The light deer's are the only ones who survived which means that the gene pool in the population will produce all light deer's.
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