__________ theory holds that identification with traditional gender roles is maintained during the active parenting years to help ensure the survival of children

Kelli always tries to be very helpful because she believes it increases her chances of receiving help at a future time. Kelli's thinking most closely reflects the concept of

a. reciprocal altruism. b. empathy. c. egoism. d. audience exhibition.

The shaft of the penis is primarily composed of _________

A) ?muscle, tendon, and bone. B) ?adipose tissue, myelin sheaths, and glia cells. C) ?nerves, blood vessels, and spongy tissues. D) ?cartilage.