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aptive growth and branching of the evolutionary tree. Evol. Earl. 12. 35-57. Hamilton. W.D.. 1972. Altruism and 'elated phenomena, mainly in social Insects. Annu. Rev. Ecol. Syst. 31. 193 232. liammond, RI_ Keller. I.. not Conflict over male parentage in social insects. MOS Biol. 2 (e248). 1472 1482.