Question

Why cannot we digest raw green plants in our alimentary canal?

Answer 1

Raw green plants cant be digested by us humans because they contain cellulose, which we can't digest.

Answer 2

we basicly can't digest them as it has cellulose and we can't digest cellulose .acc. to me in olden days early men used to survive with raw green plants because the cellulose is digested by our appendix  but slowly as  we stopped eating raw green plants the appendix lost it function tooo. so  we should always eat a  selective plant like lettuce