Research investigations of identical twins reared together and apart show that the early family environment has very little effect at all on weight gain

When infants are placed in the middle of a visual cliff, they usually

a. remain still. b. move to the shallow side of the apparatus. c. move to the deep side of the apparatus. d. approach their mothers when called, whether that requires moving to the shallow or deep side.

Which of the following best describes Vygotsky's concepts of scaffolding?

a. the belief in the uniqueness of their personal experiences and their personal destiny b. the capacity to think about thinking c. the difference between skills or tasks that adolescents can accomplish alone d. the degree of assistance provided to the adolescent in the zone of proximal development