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There are five steps in the process of Nutrition in animals. These are: Ingestion, Digestion, Absorption, Assimilation and Egestion. ... Most of the animals include both physical and chemical methods for digesting the food.
(i) Ingestion : Taking in of the food, its chewing or sucking and swallowing.
(ii) Digestion : Conversion of complex food into simpler absorbable form.
(iii) Absorption : Absorbing digested food from the gut to reach the body tissues.
(iv) Assimilation : Utilization of digested food nutrients by the body tissues.
(v) Egestion : Removal of undigested and unabsorbed food from the body.
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