specialise

devote oneself to a special area of work; "She specializes in honey bees"; "This baker specializes in French bread"

be specific about; "Could you please specify your criticism of my paper?"

suit to a special purpose; "specialize one's research"; "this kind of beak has become specialized in certain Galapagos finches"

become more focus on an area of activity or field of study; "She specializes in Near Eastern history"

evolve so as to lead to a new species or develop in a way most suited to the environment