Multiple Choice
This gas makes up approximately 1/5th of ordinary air and is used to release energy from food substances.
A) oxygen
B) carbon dioxide
C) hydrogen
D) nitrogen
E) helium
Correct Answer:

Verified
Correct Answer:
Verified
Related Questions
Q5: Parietal membranes are attached to the surfaces
Q31: The most abundant chemical substance in the
Q41: _ cause responses that alter conditions in
Q43: This region refers to the front of
Q44: The effects of a hormone on digestive
Q47: _ is a gas that makes up
Q48: A drop in room temperature to 65<sup>o</sup>F
Q49: Squinting and blinking the eyes in bright
Q50: Sweating caused by hot weather is an
Q51: The passage of substances through membranes and