Marcia's head was cone-shaped, she had some blood on the top of her head and was damp from amniotic fluid, her body was covered with a cheesy substance, she had downy hair on her ears, and her nose was flattened by its trip through the birth canal

According to Freud, the positive and constructive aspects of human behavior, such as sex, hunger, and the creative arts, are attributable to

a. the superego. b. the ego. c. Thanatos. d. Eros.

Which substage of sensorimotor development serves as a transition to the symbolic thought of the next stage?

a. tertiary circular reaction b. secondary circular reaction c. invention of new means through mental combinations d. coordination of secondary schemes