Question

HELP!! "During the ______ period, the first vertebrates appeared on Earth"

A. Cambrian

B. Ordovician

C. Silurian

D. Devonian

Answer 1

You’re answer is A- Cambrian

Answer 2

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.[