D. mixture
The air we breathe is a mixture of different gases, primarily nitrogen (about 78%) and oxygen (about 21%), along with smaller amounts of other gases such as argon, carbon dioxide, and trace gases.
The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?
A.
element
B.
liquid
C.
compound
D.
mixture
1 answer