Question

What did not occur in the Proterozoic Eon?

A. The oxygen level increased greatly in the atmosphere
B. The emergence of the Eukarya
C. Multi-celled eukaryotic organism began to diversify
D. Anaerobic bacteria kept thriving with more oxygen

Answer 1

Answer: C. Multi-celled eukaryotic organism began to diversify

Step-by-step explanation:

The Proterozoic is an eon. There were multiple organisms that appeared in this eon. They perform the process of photosynthesis which resulted in gradual pilling up of oxygen into the atmosphere, thus changing the composition of the atmosphere and setting up for future organism.