Answer:
Some viruses attack animal cells. They attach themselves to the host cells and inject the genetic material, which in turn produces new Q-viruses in the host cells. The viruses either have RNA or DNA as their genetic material.
Explanation:
Marine organisms at higher trophic levels will have higher concentrations than animals in lower trophic levels. This is because mercury is not easily eliminated from these organisms so the concentration can increase as you go up the food chain. For example, one fish eats five shrimp each with one molecule of mercury, the fish now contains five molecules. If a larger fish eats several fish with five molecules of mercury then the concentration increases through the trophic levels.
The largest portion of the brain that is also referred to as "Gray matter" is called the cerebrum
6) I think it's A, but I'm not sure.