If Some snakes have vestigial legs. Why is this considered evidence for evolution?
Vestigial legs are a clue that snakes descended from lizards, thus lending credence to evolution.
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About evolution
Evolution is a theory that asserts that all types of animals and plants have their origin in other already-existing types and that the obvious differences are due to modifications in later generations. More specifically, biological evolution is descent with modification on a small-scale (changes in gene frequency in a population from one generation to the next) as well as large-scale (the descent of different species from a common ancestor over many generations). Ultimately, evolution helps us to understand the history of life.
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