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teeth found at the back of the mouth just in front of the molars in the mammalian jaw, used for grinding and crushing food.
simple inorganic chemical substances (mineral salts) that are needed in very small amounts for...
an extreme shortage of food over a large area which affects a large number of people.
an organism that helps to spread a disease, but is not infected with the disease.
the discharge of heated water directly into rivers, lakes or the sea, usually from power plants...