Adaptive Coherence
Biology and culture evolve together. For example, cattle-herding is a cultural adaptation, and lactose tolerance is a biological adaptation. Those adaptations evolved together and fit together. Each selects for the other. The two adaptations together are more useful than either is separately. You can’t just take a bunch of lactose intolerant people and drop them into a cattle-herding culture. They will get sick, because their biology does not fit the culture. The linked adaptations of cattle-herding and lactose tolerance emerged in two different parts of the world, Europe and Africa, thousands of years ago, and have spread widely since. The coevolution of biology and culture makes them fit together. They cohere. They are codependent. Society and culture are also codependent. To live together in a society, people need a common culture, which includes language and concepts that are necessary for social organization. People develop a common culture by living together in the sam