It is not part of biological evolution theory to explain the origin of the "first" life. It is not included probably because it is not even part of it. It is like asking why the theory of gravity does not explain why the sky is blue. (It may be related though)
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For thermodynamic,
It is just clear for anyone with a bit of science to understand that earth is NOT a closed system.
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Time is precious. That would include scientist's time