Which of the following neurotransmitters was first implicated in the development of schizophrenia?

Rats become very hungry when they experience ________ levels of ________.

a. elevated; leptin b. reduced; insulin c. elevated; orexin d. reduced; estrogen

The simplest solutions to a problem involve ______

a. the use of compensatory models b. accurate representation of the problem c. creating realistic subgoals d. retrieving information from long-term memory