Invertebrates were formed and active by the time of... (in $mya$)

  • A
    $100$
  • B
    $1000$
  • C
    $500$
  • D
    $2000$

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The first life on Earth originated in ........ .

Life cannot originate from inorganic materials now because of

Which of the following was formed in $S. Miller$'s experiment?

How was the oxygen in the atmosphere produced?

In which era was there no life?

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