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the conversion of previously productive land into desert.
a form of malnutrition caused by a severe shortage of protein in the diet.
a type of nuclear division during which somatic cells divide into new cells for growth or to...
structure that contains the two centrioles arranged at right angles to each other in animal...
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
an injection of a weakened or dead pathogen into the body to build up immunity against a disease...