When can a person infected with HIV expect to notice symptoms of the virus? A. more than likely, within days of exposure
B. always within a few weeks after exposure
C. typically, four months after exposure
D. typically, but not always, within a few weeks after infection

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

How do nicotine and tobacco cause cancer? by decreasing blood-sugar levels by damaging or changing a cell's dna by increasing heart rate by increasing phlegm and mucous production

Which of these should be re portable health diseases to protect public health? a- obesity b- measles c- diabetes d-lung cancer