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a social structure in which different classes are determined by heredity.
the destruction of a donated organ by the immune system of the recipient.
an inorganic compound with the formula KOH, commonly called caustic potash. It can be used to...
the area that occurs between the high water and low water marks. It is exposed to the air at low...
a sudden severe instance of abnormal heart function accompanied by chest pains and possible...
the clearing of large areas of natural forest, mainly to free up land for agriculture and or...