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They usually know the water cycle by the time they reach high school, but struggle with carbon, nitrogen, and Page 9/31 Enzymes required for biofixation of nitrogen are nitrogenases. A. answer choices . Ans: It mainly includes the transfer of CO2 and organic carbon between the atmosphere (the source of inorganic CO2) and hydrosphere (the aqueous envelope of the earth as bodies of […] Short Answer Questions. Spell. PPT: Chapter 6 - Tissues, Class 9, Science, NCERT Solutions: पाठ 4 - साँवले सपनों की याद, क्षितिज, हिंदी, कक्षा - 9. MCQ Biology - Learning Biology through MCQs, AllRightsReserved. Be sure to include specific details from your lab experience in the explanation. 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