During Precambrian Time, simple life forms existed in the oceans of Earth. This was followed, during the Paleozoic Era, by the "great ___________ explosion" when many new life forms appeared on Earth in

During Precambrian Time, simple life forms existed in the oceans of Earth. This was followed, during the Paleozoic Era, by the "great ___________ explosion" when many new life forms appeared on Earth in a very short period of time.

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During Precambrian Time, simple life forms existed in the oceans of Earth. This was followed, during the Paleozoic Era, by the "great ___________ explosion" when many …

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