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I do not fully understand this question...

But just out of experience would you say that plants vary a little or a lot in their efficiency at producing joules for human consumption. And could you suggest reasons for the variation?

  • Science/ECology - ,

    This site may help you.

  • Science/ECology - ,

    Hmmmm. Some plants produce a lot of cellulose, and humans cant digest any of that. Plants produce oils, sugars, and some protein, and humans can digest those.

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