The volvox an algae discharge duties of its own namely division of labour .Each group doing patch of work .This way of doing duties is suitable nowadays.If any head of the family is unable the other members share the assignment of work and complete the same
eventually pigeons occured in groups sometimes in pairs it pecks the grains by its conical beaks and do not chew it grinds in such a way that corps milk when it intends to feed its young ones the young ones in nests sounds when hungry pigeons feels its signal and the pre digested milk namely corps milk it feeds its young ones while we look at this bird this bird is a passionate calm and never qurrel among other fellow birds
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