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No, Technically cordata were introduced in the late Camrian period in the form of small fish.. But The Devonian period is when the first large sharks and fish began to apear, I also believe that amphibians were on land in the mid-late devonian, and were abundant in the Carboniferous.

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12y ago
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8y ago
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14y ago

The earliest known vertibrate is Haikouichtys has been found in 530 million year old rocks fom the Cambrian Period of the Paleozoic Era.

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13y ago

The first known reptiles appeared about 320 million years ago. That was during the Carboniferous period. The Carboniferous period was part of the Paleozoic era.

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13y ago

545-500 Million Years Ago

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11y ago

The Paleozoic Era

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14y ago

No scientists know yet.

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11y ago

False false

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Q: Paleontologists believe that vertebrates first appeared in earth's history in what time peirod or era?
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