Cultural evolution: a five sentence definition

The Homo sapiens extended phenotype is all that has emerged through the neural system of the Homo sapiens organism by processes of muscular contraction.  It is also known as human culture.

The Homo sapiens extended phenotype is uniquely extensive and diverse, a physical mass of, today, around thirty trillion tons.

The Homo sapiens organism, without its extended phenotype, is ill-adapted to any natural habitat, and would be unlikely to survive.

The Homo sapiens organism is a crucial, sine qua non environment for the evolution of the Homo sapiens extended phenotype.

The last two propositions lead to the conclusion that the Homo sapiens organism and the Homo sapiens extended phenotype are obligate symbionts.

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