Question

The earliest ancestors of about half of all extant animal phyla can be traced back to the _____ explosion. see concept 32.2 (page 675)

Answer 1

The earliest ancestors of about half of all extant animal phyla can be traced back to the Cambrian explosion

The Cambrian explosion also known as Cambrian radiation was the event of approximately 541 million years ago in the Cambrian period. During this time most major animal phyla appeared in the fossil record. It resulted in the diverge of most modern metazoan phyla,.