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Question
Humans cannot digest high fibre containing substances like grass. This is because humans:
Options:
A .  Have shorter alimentary canal than herbivores.
B .  Have longer alimentary canal than herbivores.
C .  Do not produce cellulose digesting enzymes.
D .  Have evolved to have only cooked leaves.
Answer: Option C
:
C
Humans cannot digest high fibre containing substances like grass. It won't kill you, but it isn't advisable to snack on it. Human stomachs cannot digest hard raw leaves and grass easily, but cows can. This is because humans do not produce cellulose-digesting enzymes. Having a longer or a shorter alimentary canal is not a deciding factor in this.

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