What is considered to be the second step in the oxygen and carbon dioxide cycle?
A. Animals take in this oxygen in a process known as respiration.
B. Oxygen contained within rock is also eventually released into the atmosphere when
erosion occurs.
C. Oxygen is also used during the burning of fossil fuel.
D. Plants give off excess oxygen that is released during photosynthesis.
Answers & Comments
C. Oxygen is also used during the burning of fossil fuel.