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zarkam21 (zarkam21):
Help, please
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zarkam21 (zarkam21):
OpenStudy (anonymous):
Precambrian is when earth is formed
OpenStudy (anonymous):
Mesozoic is when the dino's were alive
zarkam21 (zarkam21):
Okay and ?
OpenStudy (anonymous):
Cenozoic is when coal, and lime stone was formed
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OpenStudy (anonymous):
The last one is the era of humans
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