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History, 06.10.2019 20:50 alliemmaddox

What separates an eon into eras?
a) changes in rock layers
b) spieces extinctions (changes in types of organisms)
c) 300 million year chunks
d) types of plants and animals

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What separates an eon into eras?
a) changes in rock layers
b) spieces extinctions (chan...
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