LYNETTE COOK / SCIENCE PHOTO LIBRARY LYNETTE COOK / SCIENCE PHOTO LIBRARY
Early life. Artwork of a Precambrian Earth. Space debris, such as meteorites and comets, bring in minerals and water. Algae (green, at the edge of the water) and stromatolites (olive green, small and round in the water) thrive. Volcanoes are highly active. The Precambrian period encompasses the first four billion years of the Earth's history - the time before the first animals evolved.
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