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The most important layer for all biological activity in the atmosphere is:

  • A.Troposphere.
  • B.Stratosphere
  • C.Mesosphere
  • D.Ionosphere   

Answer: A

The troposphere is the layer of biological importance.

It holds about 75 per cent of the atmosphere's mass and nearly all its water vapour, and all weather occurs in it. It extends to about 18 km at the Equator and 8 km at the poles, and temperature falls through it at roughly 6.5 °C per kilometre.

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