Sexual differentiation of the genitals begins earlier in pregnancy than sexual differentiation of the brain

The Yerkes-Dodson Law says:

a) performance on a task is affected by levels of arousal. b) the more money you make the better your job will be. c) nausea from bad food causes a reluctance to eat that food again. d) performance on tests is better in the morning.

All of the following statements about infants' motor development are accurate except

a. infants are able to use visual information to adjust their posture b. the perception system has been shown to be functionally separate from the action (motor) system c. infants learning to walk on their own fall down frequently because their gait tends to be inconsistent d. most children can run by the time they are 2 years old