Q: Fact 1: Populations of viruses do not grow through cell division because they are not cells. Fact 2: Viruses are parasites of cells. Given the two facts above, populations of viruses do not grow through division because they are what?

Available choices:
1). reproduce.
2). homogenous.
3). negative.
4). dangerous.
5). Loose.
6). parasites.
7). complex.
8). fungi.
A:
6).