Why does holden have difficulty breathing after only a short run to the main gate?

He is a heavy smoker. Mostly cases of shortness of breath are because of heart or lung conditions. Your heart and lungs are one of the carrier in transporting oxygen to your tissues and taken away carbon dioxide, and problems with either of these processes affect your breathing.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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