Jeffrey Aronson: When I Use a Word . . . Being one, two, or many

As I noted last week, animals are monophyodonts, diphyodonts, or polyphyodonts. Rodents and some cetaceans, for example, are monophyodonts—their teeth grow continuously and are never replaced. Humans, and most other mammals, are diphyodonts—they normally have two sets of teeth (dentitions), although the numbers of teeth in each dentition are different, so that the 20 deciduous […]

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