The average 8- to 18-year-old spends per day on average in front of a screen doing very little to no physical activity. A. 0 hours

B. 30 minutes

C. 1 hour

D. 3 hours or more

Please select the best answer from the choices provided.

A
B
C
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