Which organ of complex animals is the first line of defense from infection caused by microscopic and macroscopic things? A. skin B. brain C. heart D. stomach

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Skin is the first line of defense from infection caused by microscopic and macroscopic things.

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Asked 2/4/2012 11:21:52 AM

Updated 12/26/2022 7:27:02 AM

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Edited by Masamune [12/26/2022 7:27:01 AM]

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Added 182 days ago|12/9/2025 11:53:20 AM

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Last spring, a person got a cold from a particular type of cold virus. Which is the most accurate explanation of why this person will NOT likely get a second cold from the same type of cold virus? A. A particular cold virus will not be able to pass the body's first line of defense again. B. Once a particular type of cold virus invades a body, it will not invade the same body again. C. The person got vaccinated for the particular cold virus when his or her symptoms cleared after the first ...

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Asked 2/4/2012 11:26:06 AM

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