Examlex
Explain the activity theory on aging.
Precambrian
A very long interval of geologic time, from the formation of the solid earth to the beginning of the Paleozoic; it is equivalent to 90% of geologic time.
Precambrian
Referring to the eon that constitutes the earliest part of Earth's history, which ended approximately 542 million years ago.
Geologic Time
The exceptionally long period of time dealt with by geology; the time extending from the formation of Earth to the beginning of written history.
Precambrian
The long span of time before the Phanerozoic Eon, making up around 88% of Earth's history, marked by the formation of the earth and early life forms.
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