Cocaine triggers an increase in which neurotransmitter resulting in a drug "high" in the reward system of the brain?

What is the term for play in which children manipulate objects to produce or build something?

a) Functional b) Parallel c) Cooperative d) Constructive

Your textbook author views ________ as an indispensable use of animals

a. research for the treatment of human disease b. use as a source of food c. use as companions to humans d. use as a source of fur e. value as entertainment