I'm getting tired of reading about nasty stis so lemme get some , my guy. which stage of syphilis is characterized by the appearance of a chancre? the third stage the first stage the second stage the fourth stage

Fats contain how much more energy than carbohydrates and protein?

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 you know answer will mark brainliest