What is true about the transmission of HIV?

Which hormone controls the production of sperm

Ihave a really high metabolism and only weigh 70 pounds (13 almost 14). people always ask me two questions: do you ever eat and how do you eat so much and stay so skinny.i am worried that a high metabolism wont me forever. what are some safe steps i can take to maintain being fit. (also, i already work out i am a dancer so i get cardio a lot)

True or false mucous membranes destroy pathogens on the outer body surface, at body openings.