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Q 1974591456.     Answer briefly :
(a) Why are villi present in the intestine and not in the stomach ?
(b) How does pepsinogen change into its active form?
(c) What are the .basic layers of the wall.of alimentary canal.?
(d) How docs bile help in the digestion of fats?
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)