The purpose of the ______ system is to prevent foreign substances from entering the body and to attack foreign substances that are in the body.
A. immune
B. endocrine
C. nervous
D. excretory

Explanation: The immune system is the body's defense against infectious organisms and other invaders. Through a series of steps called the immune response, the immune system attacks organisms and substances that invade body systems and cause disease. The immune system is made up of a network of cells, tissues, and organs that work together to protect the body.

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The purpose of the ______ system is to prevent foreign substances from entering the body and to attack foreign substances that are in the body. A. immune B. endocrine C. nervous D. excretory

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The purpose of the ______ system is to prevent foreign substances from entering the body and to attack foreign substances that are in the body.
A. immune
B. endocrine
C. nervous
D. excretory