Exercise frequency should be...? A. 3 times/ week, Consecutive, rest in between

B. 3+ times / week, non-consecutive, rest in between

C. 3 times / week, non-consecutive, without rest in between

D. 5 times / week, non-consecutive, rest in between

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?

One of the students at your school posted akward and embarrissing pictures of another student online

Which of the following is not a symptom of chronic fatigue syndrome