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Which of the following two cycles are the most closely related in their role in sustaining life? a. carbon and nitrogen b. water and nitrogen c. carbon and oxygen d. nitrogen and phosphorus
c. carbon and oxygen we inhaled atmospheric air which is composed of a 21% oxygen, 78% nitrogen and 1% other gases. gas exchange is oxygen and carbon dioxide.
Expert answered|jbgingz|Points 118|
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Asked 5/13/2013 5:17:04 PM
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