"which of the following statements is true of aids? if a person's cd4 count is above 200, it means that he or she has aids. aids is inherited. if a person is tested hiv-positive, it means that he or she has aids. aids is the final stage of hiv infection."

AIDS is the final stage of HIV infection

Explanation:

Having an HIV positive result does not mean  having AIDS (acquired immunodeficiency syndrome). That only signals that you have a HIV virus that kills CD4 T-cells in your body. As time passes by, if there are many CD4 T-cells killed, the body looses its ability to fight infection. When this happens, HIV can advance to AIDS. HIV infection advances to AIDS when there are less than 200 CD4 T-cells per cubic millimeter of blood. If you have less than 200 CD4 T-cells, it means you have a very weak immune system, and you can easily get very sick.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

coal is not sustainable because it will one day run out.