At four weeks, the embryo is developing . a) fingers and toes b)the heart , liver, and brain c)hair and adding mass. d)stomach and bones. the inner ear is fully developed at a)1 month b)3 months c)9 months d)5 months

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?

What system have glands found throughout the body that release hormones into the bloodstream

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