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The phenomena which characterize life are as follows: the origin of the organized body from a parent; its successive development and growth; the processes of nutrition and assimilation; the combustion of effete particles of structure; and reproduction. The cessation of these phenomena constitute death.

— Joseph Leidy

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Quote text and notes from Wikiquote: Joseph Leidy (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.