Word: phyla
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Dates: during 1950-1959
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...mammal. Geology is brought in again to tie things together, as the various geologic eras provide a frame for locating different developments in evolution. And geology furnishes a good transition to studies of skeletons and dermal structure, for the evidence of these is founds in rocks. The ten main phyla are studied, with special emphasis on the chordates, and particular attention to the mammals. A study of the reproductive process in mammals provides an effective sex education...