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

  • A
    Oxygen
  • B
    Hydrogen
  • C
    Water
  • D
    Ammonia

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In which era was there no life?

Life originated in which of the following eras?

$A$ : During evolution,the early time period was without an ozone layer.
$R$ : The ozone layer absorbs $U.V.$ rays to some extent.

The first life on the earth was developed through

The theory of "continental drift" was originally proposed by

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