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How many energy pathways are commonly recognized in living systems?

  1. One

  2. Two

  3. Three

  4. Four

The correct answer is: Three

Commonly recognized energy pathways in living systems include both anaerobic and aerobic processes. These two are usually grouped together as the first and second options respectively, making two recognized pathways. The remaining choices of one and four pathways are not accurate as they do not encompass all of the commonly recognized pathways in living systems.