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Answer:
B. a substance that sends the immune system into action
Explanation:
Answer:
Explanation: It states that microorganisms known as pathogens or "germs" can lead to disease. These small organisms, too small to be seen without magnification, invade humans, other animals, and other living hosts. Their growth and reproduction within their hosts can cause disease.
WHAT IS A DISEASE?
a disorder of structure or function in a human, animal, or plant, especially one that has a known cause and a distinctive group of symptoms, signs, or anatomical changes:
WHAT IS A GERM?
a microorganism, especially one which causes disease.
someone who has hallucinations can have mental problems are can be mental ill and the illness causes them to hallucinate