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A time line of earths history
An eon divided into smaller units of time
Eras divided into smaller units of time
a period divided into a smaller unit of time
the gradual development of new organisms from preexisting organisms
the time interval that began with the formation of earth and ended about 542 million years ago
the geological era that began about 542 million years ago and ended about 251 million years ago
an enormous number of species dead
the geologic era that began about 251 million years ago and ended 65 million years ago
the division of geological time that began about 65 million years ago and that includes the present period
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