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The principal work of St. Thomas Aquinas, the Summa Theologica is divided into three parts and is designed to instruct both beginners and experts in…
LiteratureThomas, Aquinas, Saint, 1225?-1274religionCatholicismHuman DevelopmentWilhelm August Oscar Hertwig contributed to embryology through his studies of cells in development and his discovery that only one spermatozoon is…
PeopleFertilizationBiographySpermOva