Baby Max begins to cry as soon as he sees his mother pick up her car keys. Max probably does this because he learned to associate the car keys with his mother leaving. This example demonstrates

What explanation does research give for the finding that volunteers with egoistic motives tend to remain active volunteers longer than those with more altruistic motives?

a. Altruistic motives do not stand up against the personal costs of helping for long. b. Altruistic motives are not genuinely felt. c. Altruistic motives create more personal cost for the volunteer. d. Altruistic motives help one manage the personal costs of helping.

Which organism can truthfully state, "It is during my time that all body parts and organs are first put into place?"

a. The neonate b. The zygote c. The fetus d. The embryo