1. Scientists believe that ancient ancestors of all animals were (1 point)
A) single-celled prokaryotes that reproduced asexually.
B) single-celled eukaryotes that sometimes grew in colonies.
C) multicellular organisms that were probably autotrophic.
D) multicellular organisms with an alternation of generations lifecycle.
2. The Cambrian Explosion resulted in the evolution of the first (1 point)
A) dinosaurs and mammals.
B) representatives of most animal phyla.
D) land animals.
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Well....to my extend of knowledge......Prokaryotes are single-celled organisms that are the earliest and most primitive forms of life on earth. As organized in the Three Domain System, prokaryotes include bacteria and archaeans. [ Prokaryotes are able to live and thrive in various types of environments including extreme habitats such as hydrothermal vents, hot springs, swamps, wetlands, and the guts of animals.
Read more : http://biology.about.com/od/cellanatomy/ss/prokaryotes.htm ]