Which is one part of the immune system that protect the body from diseases?

mucus
skeleton
esophagus
fingernails

The correct answer is A. Mucus

Explanation

The immune system is a body system that has the function of preventing and combating diseases and germs that threaten the body and is composed of organs, tissues, proteins. One of the best-known substances produced by the immune system is the mucus, a substance produced by surface cells of different mucous membranes of the organism, particularly the mucus of the nasal passages are produced as a natural filter of the body to prevent microorganisms, viruses, and bacteria that threaten the health of the body enter through the respiratory tract. So, the correct answer is A. Mucus.

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lifetime activities are certain actions that are either required throughout your life or you choose to do them. for example, eating is considered a lifetime activity, drinking water or other beverages, keeping your body clean, taking medicine. those types of actions are considered lifetime activities.