But perhaps the most astonishing feature of multicellularity is that it evolved independently, and in multiple different species, not just once, but many, many times. It is as if the drive to become multicellular was so forceful and pervasive that evolution leapt over the fence again and again. Genetic evidence suggests this incontrovertibly. Collective existence—above isolation—was so selectively advantageous that the forces of natural selection gravitated repeatedly toward the collective. The transformation from single cells into multicellularity was, as the evolutionary biologists Richard
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