Evolution is an odd concept that not many believe in, even though there is physical evidence of it. It is the change in allele frequency over long periods of time. But the real question is, what causes evolution? And the answer to that is simple, natural selection. Natural selection kills off weaker species so only the strong survive and reproduce. Imagine a black squirrel and a white squirrel in winter. Which one do you think will survive? The white one of course because it blends in with its snowy backgrounds whereas the black one pops out. And therefore, more white squirrels survive and black squirrels die off because the predators killed them. Natural selection is a cruel yet needed process that has caused species to evolve over large amounts of time, thousands and millions of years.
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