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The process of variation and selection has a third fault: Variations are random and contingencies of selection accidental. What evolved is not a single slowly developing species but millions of different species, competing with each other for a place in the world. The product of operant conditioning is not a single coherent repertoire but thousands of smaller repertoires, conflicts among which must somehow be resolved. The evolution of social environments has produced not a single culture but many often conflicting ones. (pp. 666)