Question
Why is cellulose not digested in human body?
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$\text{C}_6\text{H}_5\text{CHO}\xrightarrow{\text{H}_2\text{NCONHNH}_2}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ||\\\text{R}-\text{CH}=\text{CH}-\text{CHO }+\text{ NH}_2-\text{C}-\text{NH}-\text{NH}_2\xrightarrow{\ \ \text{H}^+\ }$