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On average _____ square feet of the respiratory membrane is lost each year after age 30.

sdaggy1

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On average _____ square feet of the respiratory membrane is lost each year after age 30.

On average _____ square feet of the respiratory membrane is lost each year after age 30.

A) 1
B) 2
C) 3
D) 4

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tgreen77

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Thanks

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