Question

complete the sentence using one of the following terms: infections, pathogens, or bacteria. the innate immune system is comprised of several types of barriers, which keep harmful organisms and substances called , out of the body.

Explanation:

The innate immune system's barriers prevent harmful entities like bacteria and other disease - causing agents. These agents are called pathogens. Infections are the result of pathogens entering the body. So the term for harmful organisms and substances is pathogens.

Answer:

pathogens