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In the words of my biology teacher, apoptosis is "cell suicide" in which a cell's genes program the cell to die on its own. Apoptosis is a beneficial biological process used to prevent tumors from spreading and in human embryonic development. When apoptosis is not activated during embryonic development, the webbing between fingers and toes does not die. As a result, some people have webbed feet or hands.
Contributed by Grace Li-Haug