Ptyalin acts upon

$A$: Gastrectomy causes iron deficiency anaemia.
$R$: Hydrochloric acid secreted by oxyntic cells converts ferric into ferrous and iron is absorbed as ferrous ions.

Identify the $CORRECT$ match of the site of action on food substrate,enzyme acting on it,and its end products in the following reactions.

Differentiate between Chyme and completely digested food.

In herbivorous animals,the appendix helps in the digestion of . . . . . . .

In rabbit,peristalsis is: