Infants do not turn their heads in response to a sound until they are at least 3 months of age

What can a 5-year-old do that a 2-year-old cannot?

a. Hop a step or two with both feet. b. jump c. climb stairs, one foot up a stair, then the second foot to the same stair. d. hop on one foot.

When conducting a research study, what group receives the independent variables (treatment)?

Cohort group Comparison group Control group Experimental group