Which of the following describes illegal or street drugs? They have no legitimate purpose.
They help treat common illnesses.
They are highly regulated.
All of the above

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?

Can someone give me one specific health problem, and explain it. !

The bones of the extremities are parts of the a-appendicular skeleton b-axial skeleton c-long bone group d-medial skeleton