History of life on earth

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Last updated 2:39 AM on 10/6/26

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Geologic time scale

Evolutionary changes that took place over very long periods of time.

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Biota

All organisms of all kinds living at a particular time or place

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Stratigraphy

The study of ages of rocks relative to one another

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Radioisotopes

Used to determine the actual age of rocks because they decay in a predictable pattern

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Half-life

Time interval over which one half of the remaining radioisotope decays, to become another element