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RE: Why can't humans survive on grasses?
Ruminant have the enzyme cellulase too which makes it easier for them to break down grasses. Also it cellulose is a polysaccharide and involves enzymes to be broken down just like starch too. Humans do not have cellulase making digestion of grasses and plant limited. Well said sir. Thanks @gentleshaid
You are absolutely right. Thanks for the short but terse addition.