The prevention of second-hand smoking.
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Well the hormone would be one thing. I'd say because it strengthens our heart muscles and trains our breathing pattern to be more effective. These would lead to more efficient transportation of blood and hence oxygen to our whole body including our brain. Our brain becomes more alert, and our body more energetic.
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I believe the answer is A: store and transmit genetic information
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This standard requires empoyers to keep employee exposures at or below the permissible exposure limits specified in the standard on air contiminants and in other substanve specific health standards.