Oxygen and carbon dioxide (5)
I believe the answer is:
gases
(Other definitions for gases that I've seen before include "Compressible fluids" , "Eg, O, H, Ne, CO, etc." , "Such as neon, hydrogen" , "Eg, helium, nitrogen" , "Neon, oxygen, etc" .)
I believe the answer is:
gases
(Other definitions for gases that I've seen before include "Compressible fluids" , "Eg, O, H, Ne, CO, etc." , "Such as neon, hydrogen" , "Eg, helium, nitrogen" , "Neon, oxygen, etc" .)