A man gives his best friend some money knowing that his best friend may help him out with money at some later time. Researcher C. Daniel Batson would categorize the man's helping behavior as an instance of

Hearing begins when sound waves bump against the _______

a. earlobe b. eardrum c. oval window d. round window

According to Piaget, children learn to retrace their thoughts, correct themselves, see more than one dimension to a problem, but cannot yet handle abstract concepts during the __________ stage

a. preoperational b. formal operational c. concrete operational d. sensory-motor