(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.