If someone is interested in the relationships between behavior and the body, what area of science do they work in?

During puberty, the neurons become more responsive to excitatory neurotransmitters. As a result, adolescents

What will be an ideal response?

Approximately how many self-help groups are currently operating in the United States?

a) 500,000 b) 1 million c) 6 million d) 12 million