Which of the following living organisms originated first on primitive earth?

Biology · Class 12 · CBSEMock Test 32 Zoology

Which of the following living organisms originated first on primitive earth?
  1. Aerobic heterotrophs
  2. Aerobic autotrophs
  3. Anaerobic heterotrophs
  4. Anaerobic autotrophs

Answer

(C) Anaerobic heterotrophs

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