How does physical fitness/exercise helps with the following diseases? High Blood Pressure, Diabetes and Stress.

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?

Which of the following is an argument against buying local fruits and vegetables?

Amalignant tumor that originates within glandular tissue is called