Can someone get an erection without going through puberty

How do nicotine and tobacco cause cancer? by decreasing blood-sugar levels by damaging or changing a cell's dna by increasing heart rate by increasing phlegm and mucous production

Explain what causes the skin to burn in the sun? explain why people should avoid the sun if taking a photosensitive medication?

The nutrient facts label on a food package lists the following: iron 50%. what does this figure indicate?