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tar
Subject:

a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.

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a group or category in the biological classification system (the plural of taxon is taxa).

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the practice and science of classification. This is the part of systematics that is only...

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(also called lithospheric plates) massive, irregularly shaped slabs of solid rock.

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small structures found in the jaw that are used for biting and chewing food.

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