During cellular respiration, every living thing in this food web uses ______ gas and releases ______ back into the environment.
http://www.usatestprep.com/modules/gallery/files/49/4986/4986.gif
A) carbon dioxide:oxygen
B) oxygen:carbon dioxide
C) carbon dioxide:hydrogen
D) carbon dioxide:water vapor

Question

During cellular respiration, every living thing in this food web uses ______ gas and releases ______ back into the environment.
http://www.usatestprep.com/modules/gallery/files/49/4986/4986.gif
A) carbon dioxide:oxygen	
B) oxygen:carbon dioxide	
C) carbon dioxide:hydrogen	
D) carbon dioxide:water vapor

anonymous · Answer

B, oxygen is used during aerobic cellular respiration and releases CO2