Question

A person constantly comes in contact with pathogens that can infect body cells and cause disease. Which organ system is involved in protecting the body from both infectious and noninfectious diseases? A. muscular system B. reproductive system C. nervous system D. immune system

Answer 1

D Immune system
That is your answer hope this helps :D

Answer 2

D. Immune System

Reproductive system is an obvious wrong answer, nervous system works with your nerves, and muscular is strength.