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a pore in nuclear membrane that enables macromolecules to enter and leave the nucleus.
small protrusions on the surface of mammalian teeth (premolars and molars), which help to grind...
a sensation of unease and discomfort in the upper stomach with an involuntary urge to vomit. A...
regions or bundles of vascular tissue consisting of xylem and phloem separated by cambium.
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.