How long is live on earth

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?

If mary has stopped her resistance training for three weeks, once she continues, she should work out harder to get back in shape keep her workout the same as before her break reduce the weight during the workout session reduce the rest times between sets

Write an essay describing and predicting the effects of fitness-related stress management techniques on the body. should be at least 3 paragraphs