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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

Biography

Author Profession: Author
Nationality: English
Born: April 25, 1979

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