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the formation of layers of water of different temperatures in large bodies of water - dams, lakes, seas and oceans.
an infectious disease caused by the bacterium Mycobacterium tuberculosis thatusually...
(also called heterotrophic organisms) organisms that are not able to produce their own organic...
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...
small structures found in the jaw that are used for biting and chewing food.