Available choices:
[A]. carbon dioxide;
[B]. oxygen;
[C]. argon;
[D]. nitrogen;
Q: Answer the following question given this paragraph: Most of the atmosphere is nitrogen, but it doesn't do much. Carbon dioxide and oxygen are the gases in the atmosphere that are needed for life. Q: What is the most prevalent gas in the atmosphere, but not the most vital for life? A:
A:
[D].