In this part

lthough many of us like to tell ourselves that we're different from other organisms in some fundamental ways, we're all subject to evolutionary processes. So evolution doesn't pertain only to animals, plants, bacteria, etc. It pertains to humans as well. As this part explains, we have our own evolutionary history as a species and an evolutionary future, as well.

Ironically, the other species that poses the biggest challenge — and threat — to us and therefore deserves attention in this part is the one we can't even see (without help): the microbes, like bacteria and viruses, organisms that evolve amazingly quickly and in response to the medicines we use to fight them.

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