What part of a vertebrate's brain is the center for thinking and complex behaviors?

What are two reasons for why a species might disappear from the fossil record?

Which sequence correctly shows the path of carbon dioxide during repiration?

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c. ozone layer hole d. increase in sea levels