No, it doesn't "adapt." It refers to a concept that doesn't change. If three people bake a cake, all doing equally much, in no human society will it be considered fair to give Billy two thirds of the cake. Now, in the past, or in the future.
The notion that morals are just a social construct is absurd. Does a blank slate human have a preference for other people suffering or for other people not suffering? Does he prefer for babies to die or for babies to live? Would Gandhi take a pill that makes him want to murder?