21. is the cell in figure 7-2 a prokaryote or a
eukaryote? how can you tell? use the
features labeled a, b, and c to describe
the cell.

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

Many animals cannot sweat to maintain a stable body temperature. what is one other way animals can cool down?

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