What are the two basic lines of defense for the human body?

Name: What are the two basic lines of defense for the human body?
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Natural immunity is the body's first line of defense against infection. It is made up of physical barriers, such as the skin and mucous membranes, and chemical barriers, such as stomach acid. Acquired immunity is the body's second line of defense against infection. It is made up of antibodies and white blood cells that are produced in response to a specific infection.

What Are the Two Basic Lines of Defense for the Human