Multiple choice

1. Scientists believe that modern humans appeared during the _______ epoch.

A. Pleistocene 

B. Pliocene 

C. Miocene

D. Paleocene

2. In a population of horses, an extreme phenotype is favored and the distribution of genes in that population shifts toward that phenotype. This process is called _______ selection

A. random 

B. stabilizing 

C. disruptive

D. directional

3. Which of these creatures are annelids?

A. Gastropods 

B. Earthworms 

C. Planarians

D. Sponges

4. Which of the following is a type of archaea?

A. Algae 

B. Mold 

C. Halophiles

D. Spirilum