Which group of the earliest photosynthetic organisms appeared during the origin of life?

  • A
    Probacteria
  • B
    Protobacteria
  • C
    Cyanobacteria
  • D
    Primitive bacteria

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The gases present in the primitive atmosphere were:

Which of the following is most essential for the origin of life?

Select the wrong pair.

In which era was there no life?

There was no life in which of the following eras?

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