Question

During which eon did invertebrates begin to populate the earth?

a. amebic eon
b. archeaon eon
c. phanerozoic eon
d. proterozoic eon

Answer 1

c. phanerozoic eon Im like 25% sure

Answer 2

the answer is d. proterozoic eon.

Step-by-step explanation:

During the Proterozoic eon, the first multicellular life evolved, including colonial algae, soft-bodied invertebrates, and sponges.