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The first hint to crack the puzzle "Ventilation is exchange of __ for carbon dioxide" is:

It is a word which contains 6 letters

      

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The second hint to crack the puzzle "Ventilation is exchange of __ for carbon dioxide" is:

It starts with letter o

o      

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The third hint to crack the puzzle "Ventilation is exchange of __ for carbon dioxide" is:

It ends with letter n

o      n

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Looking for extra hints for the puzzle "Ventilation is exchange of __ for carbon dioxide"
o      n
Click on any empty tile to reveal a letter

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The answer for the puzzle "Ventilation is exchange of __ for carbon dioxide" is:
o x y g e n

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