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Geologists have divided Earth's history into time units,
which are largely based on fossils.

 

Fossils are the
preserved remains or traces of animals, plants, and other organisms from the
remote past.

 

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Geologists use fossils to divide the world's history into eras and periods. Fossils of organisms,  plants and animals are old traces that can be used to determine the era which it belongs. Its age is determined through the conventional method: carbon dating. 

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