Laura and Kyle are sitting next to each other and are drawing pictures. Periodically, they will trade crayons and comment on the other's picture. This is an example of

One of the first neurochemical theories of schizophrenia focused on altered activity of which of the following systems?

a. serotonin b. dopamine c. norepinephrine d. estrogen

Amy is shown 6 white wooden beads and 10 green wooden beads. She is asked if

there are more green beads or more wooden beads. This would be a test of (a) class inclusion (b) conservation of number (c) object permanence (d) conservation of mass (e) conservation of beads