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Answer :
(a) The main steps of nutrition in humans are ingestion, digestion, absorption,assimilation and egestion.
(b) The largest gland in the human body is liver .
(c) The stomach releases hydrochloric acid and digestive juices which act on food.
(d) The inner wall of the small intestine has many finger-like outgrowths called villi.
(e) Amoeba digests its food in the food vacuole.