Life evolved under conditions of light and darkness, light and then darkness. And so plants and animals developed their own internal clocks so that they would be ready for these changes in light. These are chemical clocks, and they're found in every known being that has two or more cells and in some that only have one cell.

Jessa Gamble

Animals Being Cell Cells Changes Chemical Clocks Conditions Darkness Developed Every Evolved Found Internal Known Life Light More Only Own Plants Plants And Animals Ready Some Then Two Would

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