Mucous membranes: a) lines cavities of the body that are open to the outside b) secret thin watery serous fluid c) cover the outside of such organs as the kidney and stomach d) are found lining?

Mucous membranes: a) lines cavities of the body that are open to the outside b) secret thin watery serous fluid c) cover the outside of such organs as the kidney and stomach d) are found lining?

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