One of the main strengths of the U.S. Supreme Court's definition of obscenity is that it is objective and easy to interpret

Infant day care is of high quality if caregivers emphasize, among other things

a regular nap and quiet time for all infants. a variety of caregivers every day. each infant having his or her own playpen. sensorimotor exploration.

Defective color vision is more common among males than females because

a. males have fewer cones than females. b. genes for photopigments are carried on the Y chromosome. c. as a result of higher estrogen levels, females produce more rhodopsin than males. d. genes for photopigments are carried on the X chromosome. e. as a result of lower estrogen levels, males produce more rhodopsin than females.