How do drugs interfere with the nervous system?

During the first month of development, how many layers of cells make up the embryo? a. 1 b. 2 c. 3 d. 4

Which is the best decision you could make about tobacco?

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 dacer so i get cardio a lot)