Which deficiency will most likely impair a child’s growth, mood, attention span, focus, and ability to learn?
a. iron
b. sodium
c. vitamin c
d. vitamin a

Which of the following is a way to prevent poisoning? a. avoid the overuse of bleach and disinfectant. b. keep carbon monoxide detectors away from the kitchen. c. follow medicine prescriptions properly. d.

Active immunity refers to: a. the defenses people are born with. b. temporary immunity granted from another source. c. immunity gained through immunization and exposure to diseases. d. natural immunities that protect humans from other animal diseases

If human development really does proceed continuously, what value does stage theories of development have?