The fact that mammals (including humans) and fruit flies have similar genes regulating their daily "clocks" suggests that

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The fact that mammals and fruit flies have similar genes regulating their daily "clocks" suggests that maintaining a daily "clock" is essential to the normal function of all animals. This does not necessarily mean that clock genes are also found in prokaryotes, or that mammals evolved from fruit flies. It simply indicates a shared evolutionary history in which the ability to keep time was important for survival.

The Fact That Mammals (Including Humans) and Fruit Flies Have