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Biology 11 Online
OpenStudy (anonymous):

3.   Which of the following body systems are involved in the first line of defense of the immune system against infection?  (1 point) integumentary, digestive, respiratory nervous, circulatory, skeletal muscular, endocrine, urinary urinary, skeletal, integumentary

OpenStudy (petiteme):

It is integumentary, digestive, respiratory. The first line of defense consists of the physical barries, the chemical barriers then the microbes that helps our skin.

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