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Question

There is no possibility of chemical evolution of life on the Earth today, because

A
The atmosphere is oxidising.
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B
The atmosphere is deoxidising.
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C
The atmosphere is reducing.
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D
The atmosphere is partially oxidixing.
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Solution

The correct option is B The atmosphere is oxidising.
  • There is no possibility of chemical evolution of life on the Earth today because the atmosphere is oxidising.
  • The evolution of life is in response to changes in the environment. Many of these changes are linked to changes in climate and/or geology.
  • There was no O2 present in the early atmosphere. Any O2 outgassed would have reacted with the metals of the crust, causing oxidation. This lack of O2 is crucial for the formation of organic molecules.
  • Thus the correct answer is option A.

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