Relatively few invertebrates existed at the beginning of the Mesozoic, but by the end of the Cretaceous, they were more abundant and diversified.

Name: Relatively few invertebrates existed at the beginning of the Mesozoic, but by the end of the Cretaceous, they were more abundant and diversified.
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This statement is true. Fossil records show that invertebrate diversity increased over the course of the Mesozoic era, with a significant rise toward the end of the Cretaceous period.

Relatively Few Invertebrates Existed at the Beginning of the Mesozoic