Samuel became upset when he found out his roommate Jake ate the last slice of pizza in the fridge. He responded by hiding Jake's algebra homework. Hiding Jake's homework in response to Jake's pizza eating is an example of ___________

Which of the following statements about handedness is most accurate?

a. The prevalence of left-handedness in some African countries is as low as 1% because using the left hand is suppressed. b. Children first develop this tendency during the preschool years. c. Children who are left-handed are often praised for their uniqueness in non-Western cultures. d. There is no genetic component to handedness; it is based purely on one's environment.

What is the minimum number of groups needed to test the effects of a single IV?

A) one B) four C) three D) two