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HELP!! "During the ______ period, the first vertebrates appeared on Earth" A. Cambrian B. Ordovician C. Silurian D. Devonian
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HELP!! "During the ______ period, the first vertebrates appeared on Earth"

A. Cambrian

B. Ordovician

C. Silurian

D. Devonian

User Rafs
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You’re answer is A- Cambrian
User Sarahjane
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Answer:a

Explanation:Vertebrates originated about 525 million years ago during the Cambrian explosion, which saw the rise in organism diversity. The earliest known vertebrate is believed to be the Myllokunmingia.[

User GusP
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