The first vertebrates appear in the fossil record during the
A)Pleistocene.
B)Paleozoic.
C)Paleocene.
D)Mesozoic.
E)Cenozoic

Name: The first vertebrates appear in the fossil record during the A)Pleistocene. B)Paleozoic. C)Paleocene. D)Mesozoic. E)Cenozoic
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The first vertebrates appear in the fossil record during the Paleozoic era, which spans from about 541 to 252 million years ago. This era is known for the emergence of a wide variety of marine life, including the first vertebrates.

The First Vertebrates Appear in the Fossil Record During the