The body's first line of defense against invasion of organisms is
A) the skin.
B) chlorination.
C) white blood cells.
D) fever.

Question

Quizplus · Accepted Answer

The skin is the body's first line of defense against invasion of organisms. It acts as a physical barrier preventing entry of harmful microorganisms into the body. Chlorination is a method used to treat water and does not play a role in the body's defense system. White blood cells and fever are important mechanisms of the immune system, but they are not the body's first line of defense.

The Body's First Line of Defense Against Invasion of Organisms