Answer:
mucus.
Explanation:
Mucus is an important part of the immune system. It traps bacteria and other pathogens and keeps them from entering the body.
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The one part of the immune system that helps protect the body from diseases is mucus. The correct option is A.
Mucus is a sticky aqueous substance produced by the mucus gland. The mucus can be of different colors. They are part of the immune system because they carry out harmful substances with them out of the body.
Thus, the correct option is A, mucus.
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