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.
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Home » Biology » 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.