Answer:
the study of the structure, reaction, and composition of different kinds of substances
Explanation:

What kind of question is that? But i agree:D
Answer:
Being healthy is a positive trait. But i don't think it is realistic at a young age. But if it's a high school maybe.
Explanation:
When a 15 years old plans to go to a nightclub without informing his or her parents and is afraid of being caught indicates an typical adolescent behavior. It is the behavior in the teen years and it's determined by their moral and <span>behavioral code.</span>
Explanation:
all the best on your exam