Refer to the figure. The figure shows the _______ era, during which atmospheric O₂ levels were almost equal to that of the present, and hard-bodied invertebrates were abundant and diverse in the sea.

Question

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The figure shows the Paleozoic era, as indicated by the presence of hard-bodied invertebrates in the sea. During this era, which lasted from about 541 to 252 million years ago, atmospheric oxygen levels were almost equal to that of the present, allowing for the proliferation of these organisms. The other eras listed (Precambrian, Mesozoic, Cenozoic, Proterozoic) are not indicated by the figure.

Refer to the Figure