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barrier made of coral (a living organism consisting of animal and algal tissues) that lies in the warm, shallow waters of the tropical oceans.
(also called a glacial age) a long period of low temperature on Earth, during which large sheets...
the structural and functional unit of the kidney, which filters the blood and produces urine....
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.
an infectious disease caused by the bacterium Mycobacterium tuberculosis thatusually...
living ground tissue with thick-walled cells that gives strength, support and protection to a...