1.

How and when did the life appear on earth?

Answer»
  • Different kinds of gases including water vapour formed the atmosphere on earth. 
  • Most of these gases were such that life as we know it today could not survive on it.
  • Because it did not have oxygen necessary for life to survive. It took a long time for the air to develop. 
  • Then life appeared on oceans first.
  • It slowly evolved into diverse forms – plants, animals and human beings.


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