Question

Mesozoic era: reptiles :: paleozic era :

Answer 1

Answer:

The answer is Invertebrates

Explanation:

At the beginning of the Paleozoic, life existed only in or near the ocean. ... The most abundant animals on land and sea during the Paleozoic were those like shellfish and insects that lacked backbones, so the Paleozoic is often called "The Age of Invertebrates."

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