Well a person breathes harder when he/she exercizing because you are working hard and your body is not used to it so your trying to pass more air through the lungs
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Radioactive waste, which can be very bad for humans and cause cancer.
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Table sugar
Hydrogen, oxygen & nitrogen are elements. Sugar is a compound.
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4) to aid in the transmission of an impulse, neurotransmitters are secreted into a synapse
