A bird has two baby chicks. One of the baby chicks has a mutated gene that lets it fly faster than its brother. Its brother gets eaten by a snake because it’s slower but the mutant baby escapes because it can fly faster. He survives to have lots of baby chicks that are also fast fliers.
Eventually, over thousands of generations, the mutations build up to produce a baby chick that’s unrecognizable from the original fast baby chick. A brand new species. Evolution.
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