Infants particularly like toys that respond to their actions

Mary Calkins is best known for

a. her effective personality tests. b. her successful therapy to treat depression. c. her valid psychological personality theories. d. being the first woman to become president of the APA. e. her legalized birth control and safe contraception.

The text shows some pictures of rats in various kinds of cages, varying in the

complexity of the rats' environments. This research demonstrated the effects of (a) early experience (b) social influence (c) cooperation (d) the genetic component of animal intelligence (e) the presence of others