Air entering the lungs is -------

Options :
  1. contains only oxygen
  2. cool and filtered
  3. warm and filtered
  4. none of the above
Answer and Explanation :-

Answer: Option 3

Explanation:

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But goodness alone is never enough. A hard, cold wisdom is required for goodness to accomplish good. Goodness without wisdom always accomplishes evil.
-Robert A. Heinlein Stranger in a Strange Land