1) Water- essential for life! a) b) c) d) 2) Hydrogen Peroxide- cleans wounds a) b) c) d) 3) Carbon Dioxide: We breathe it out and it's a greenhouse gas. a) b) c) d) 4) We breathe in oxygen. a) b) c) d) 5) Air is about 80% nitrogen gas. a) b) c) d) 6) Methane gas burns easily! a) b) c) d) 7) The wake me up molecule! a) b) c) d) 8) The get me clean molecule! a) b) c) d)

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