Which of the following statements best describes diversity in sub-Saharan Africa?
A. There are only a few ethnic groups and languages spoken.
B. There are more than a thousand languages spoken, but only a few ethnic groups.
C. There are hundreds of ethnic groups, but only a few languages are spoken. D. There are hundreds of different ethnic groups, and more than a thousand languages are spoken.

Why are fossils of organism's from the phanerozoic eon much more likely to be found than fossils of organisms from any other eon? a. more organisms present during the phanerozoic eon had soft body parts. b. organisms present during the phanerozoic eon were all microscopic. c. more organisms present during the phanerozoic eon had hard body parts. d. organisms present during the phanerozoic eon are the most ancient life forms.

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d

An enormous wave generated by an earthquake beneath the seafloor is known as a