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  1. Scientists believe that ancient ancestors of all animals were (1 point)
Asingle-celled prokaryotes that reproduced asexually.
Bsingle-celled eukaryotes that sometimes grew in colonies.
Cmulticellular organisms that were probably autotrophic.
Dmulticellular organisms with an alternation of generations lifecycle.

  1. The Cambrian Explosion resulted in the evolution of the first (1 point)
Adinosaurs and mammals.
Brepresentatives of most animal phyla.
Cbacteria.
Dland animals.

Verified Answer :

1) Scientists believe that the ancient ancestors of all animals were single-celled eukaryotes that sometimes grew in colonies.
Eukaryotic cells have membrane-bound organelles such asmitochondria and the Golgi apparatus.
The best answer is :
B) single-celled eukaryotes that sometimes grew in colonies

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