Matter cycling and energy flow with and without oxygen
Matter cycles through an ecosystem, reused again and again, while energy flows through it in one direction instead of cycling, and how efficiently both matter and energy move depends on whether oxygen is present: aerobic processes, which use oxygen, release energy far more efficiently than anaerobic processes, which don't. Both kinds of processes happen in real ecosystems, often in different parts of the same environment, like the oxygen-rich surface versus the oxygen-poor mud at the bottom of a pond.
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