_______ is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer. A. Radon B. Hydrogen C. Nitrogen D. Carbon monoxide
Radon is a naturally occurring gas that's found in most soils and rocks and can cause lung cancer.
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kiara07|Points 9822|
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Asked 2/6/2018 6:37:33 PM
Updated 2/7/2018 5:47:50 AM
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