Larry is taking a walk in the park. The pollen in the air makes him sneeze constantly. What line of defense is his immune system exhibiting? A. first line of defense B. second line of defense C. third line of defense D. fourth line of defense

Alcohol can damage a still developing a0 and put one in risky situations.

What creates an electric force field that moves electrons through a circuit? a. energy sourceb. loadc. metal wiresd. resistance

How is health different for most people in this country today from what it was for people born in 1900? a. people have a shorter life span. b. people today work harder to survive. c. people today live in poorer sanitary conditions. d. people today can focus less on day-to-day survival and more quality of life.