Why do you suppose that, to our knowledge, animals have not evolved the ability to break down cellulose without the help of microbes?
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Mark,
Wat a lovely comment! As I've said before, I would love to be in your class. You make a key point in Biology. Thanks a lot.
Elio
Posted by: Moselio Schaechter | May 01, 2014 at 08:59 AM