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Q. The order of appearance of the main group of organisms during evolution can best be described as follows:

  • (A) autotrophic, anaerobic heterotrophic, aerobic heterotrophic
  • (B) anaerobic heterotrophic, water oxidising autotrophic, aerobic heterotrophic
  • (C) aerobic heterotrophic, anaerobic heterotrophic, autotrophic
  • (D) anaerobic heterotrophic, aerobic heterotrophic, water oxidising autotrophic
  • Correct Answer - Option(B)
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