geologic period known as the Mesozoic era, the world would not appear entirely strange to us. Among plants, we might recognize some members of the angiosperms,1 to which belong our present-day grasses, flowers, vegetables, shrubs, and most of our modern trees. In the animal kingdom, by contrast, we would confront those ancient reptiles known as dinosaurs. The careful observer also might note the existence of some small primitive mammals-to which we human beings can trace our own beginnings. Thus, both forms…
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