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a pure substance made of only one type of atom. An element cannot be broken down into simpler substances.
a pore in nuclear membrane that enables macromolecules to enter and leave the nucleus.
hollow tubular vascular tissue cells, strengthened with lignin that conducts water and mineral...
a response of the body tissues to injury or irritation. It causes pain, swelling, redness and...
(also called the carina) in birds is an extension of the sternum (breastbone) which runs along...