Oxygen is essential for cellular respiration for all aerobic organisms.
Besides nitrogen and oxygen, the atmosphere contains many, many other molecules in trace amounts.
The atmosphere is essential for cellular respiration.
What is essential for cellular respiration?
A: Veins and arteries.
B: kinetic energy
C: The atmosphere
D: Energy.
E: heat energy
F: Organic compounds
G: Chemical energy
H: flow of electrons