___ lymphocytes are formed in the marrow of bones, and they are responsible for fighting bacterial infections

Both __________ and __________ emphasize many possible courses of development

A) the psychoanalytic perspective; ethology B) ethology; evolutionary developmental psychology C) cognitive-developmental theory; behaviorism D) behaviorism; social learning theory

Newborns and infants:

a. have few perceptual abilities. b. need visual experiences during a critical period for vision to develop normally. c. see as well as adults.