The mucus lining of organ systems open to the external environment is an example of ________ defense. first line second line zero line third line
The mucus lining of organ systems open to the external environment is an example of ________ defense. first line second line zero line third line
Chapter3: Meat And Bones
Section: Chapter Questions
Problem 21FITB
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51.
The mucus lining of organ systems open to the external environment is an example of ________ defense.
first line
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second line
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zero line
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third line
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