Living things can consist of these single-cell entities, or they can be multicell organisms composed of blocks of individual cells. But the network perspective on life leads to an interesting and highly pertinent question: Do individual life forms actually exist? Individual living things do seem to exist, in the sense that we are surrounded by what appear to be examples of individual life forms—birds, bees, camel, humans, and, of course, unicell life, primarily bacteria, all seemingly going about their individual business. In practice, however, that individuality is not quite as clear-cut as
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