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the conversion of previously productive land into desert.
a genus of the Protozoa consisting of shapeless unicellular organisms that move by means...
cone-shaped mammalian teeth used to grip and tear off pieces of meat.
the second biological classification group (taxon) that is divided into phyla (for animals) or...
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...