Where did Air Is Made Up Of Mostly Nitrogen And This Gas appear in the Game?

It appeared on Past and Present Tech Group 1459 Puzzle 5

Air Is Made Up Of Mostly Nitrogen And This Gas

CodyCross Air Is Made Up Of Mostly Nitrogen And This Gas Solution

This question is part of CodyCross Past and Present Tech > Group 1459 > Puzzle 5.
Answers of Air Is Made Up Of Mostly Nitrogen And This Gas might change from time to time on each game update.

Air Is Made Up Of Mostly Nitrogen And This Gas

Oxygen

For more CodyCross Past and Present Tech Answers open the previous link.

What is the rating you give to Codycross?
1 Star

(294 votes, average: 3.49 out of 5)