physiology

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An Energy System Primer, Part 1

Last week I was with a group of students who were learning about the carbon dioxide cycle in class. This is the one where plants produce oxygen, animals consume it and produce carbon dioxide, which the plants then consume. That gets into a discussion on what carbon dioxide is, what oxygen is, what would happen if part of the cycle was missing (i.e. what if all the plants died?), that sort of thing. But I stumped the class when I...