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OpenStudy (anonymous):
Which of the following geologic time periods is associated with the birth of Earth and the first appearance of the earliest life forms? Cenozoic Mesozoic Paleozoic Precambrian
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OpenStudy (anonymous):
The choices don't go far enough back in time. It's the Hadean that's associated with the birth of the planet, and the Archaean is when life originated. Of the choices given, pre-Cambrian is the best.
OpenStudy (anonymous):
okay, thank you. i appreciate it very much.
OpenStudy (anonymous):
i've done research and it didn't make sense to me either.
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