What is the tendency to exert less effort when working on a group task if individuals' contributions will not be evaluated?

Memory is defined as the capacity to

a. visualize. b. feel and emote. c. perceive events. d. encode, store, and retrieve information.

When speaking of evolution, the term "fitness" refers to

(a) an increase in the amount of DNA (b) a decrease in one's gene pool (c) increased reproductive success (d) increased strength and size