Name the actual site of exchange of gases in the lungs is --------

Options :
  1. pleura
  2. bronchioles
  3. tracheoles
  4. alveoli
Answer and Explanation :-

Answer: Option 4

Explanation:

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You tell me: 'Life is hard to bear.' But if it were otherwise why should ou have your pride in the morning nad your resignation in the evening?
-Friedrich Nietzsche Thus Spoke Zarathustra