Question

Scientists believe that ancient ancestors of all animals were.

A. Single-celled prokaryotes that reproduced asexually
B. Single-celled eukaryotes that sometimes grew in colonies
C. Multi-cellular organisms that were probably autotrophic.
D. Multi-cellular organisms with an alternation of generations lifecycle.

Answer 1

A is the answer
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Answer 2

The correct answer is B. Single-celled prokaryotes that sometimes grew in colonies