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the bodys first line of defense against the enviroment, disease, parasites, and injury is made up of A.) blood cells B.) muscle cells C.) nerve cells D.) skin cells​
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the bodys first line of defense against the enviroment, disease, parasites, and injury is made up of A.) blood cells B.) muscle cells C.) nerve cells D.) skin cells​

User Hamit YILDIRIM
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the answer is D.) skin cells

User Derek Lee
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