| 21. | Older primitive forms of mammals declined in variety and importance.
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| 22. | Even the most primitive form of smoking requires tools of some sort to perform.
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| 23. | This Frobenius manifold structure also relates to Saito's primitive forms.
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| 24. | The procedure evolved from a primitive form of surgery known as trephining or trepanning.
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| 25. | He describes mankind as evolving over many millions of years from a primitive form.
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| 26. | Decorated with a pattern of abstract crosses, the vaults'low primitive forms evoke underground catacombs.
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| 27. | The first primitive form of pedal harps was developed in the Tyrol region of Austria.
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| 28. | "It's a primitive form of filing, " he conceded.
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| 29. | In its primitive form, nature has to do with procreation and who is childbearing stock.
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| 30. | Miners used to take canaries into the shafts as a primitive form of pollution alert.
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