The coevolution of biology and culture excites more debate, though Ehrlich's examples are compelling.
Agricultural practices are cultural artifacts but they alter the evolution of human blood cells.
Similarly, human scientific culture devised DDT and, as a result, natural selection has produced increasing numbers of DDT-resistant insects. Even human perception is shaped by culture as well as physiology, as in the case of the Mbuti Pygmy who, on leaving the Ituri Forest in the Congo, saw distant vistas for the first time and could not initially make the perspective adjustments necessary to understand that the apparently small animals many miles away were actually large buffalo (pp. 133-3)
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