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

Question

kicyunya [14]

3 years ago

15

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

e 675)

Biology

1 answer:

Vesna [10] · Answer 1 · 2022-02-05T23:31:03+03:00

The answer is 'Cambrian' explosion. This took place approximately 541 million years ago. 'Explosion' refers to the evolution of a large range of new major animal phyla. Scientists know this by the large number of diverse fossils from this period. Prior to this period, organisms were single-celled, but over the Cambrian Explosion, lasting about 80 million years, life forms diversified rapidly to resemble the life forms existing today.