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Q. Some of the mineral elements required in extremely small quantities (traces) are called microelements. Group of such elements are
  • A. copper, zinc, magnesium, iron and sulfur
  • B. zinc, copper, manganese, molybdenum and boron
  • C. molybdenum, boron, zinc, magnesium and calcium
  • D. manganese, zinc, iron, boron and calcium