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the seepage of acidic, contaminated water from disused mines and mine dumps.
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
a muscular structure on the floor of the mouth of most vertebrates, which manipulates food for ...
a sudden severe instance of abnormal heart function accompanied by chest pains and possible...
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...
single-celled algae that have two flagella and are found mainly in seawater but are also common...