Answer:
We breathe (mostly) an homogeneous mixture of elements: elemental nitrogen, N2 ; elemental oxygen, O2 . The mixture is homogeneous because the dioxygen and dinitrogen are in the same phase and state.
A mixture is a material made up of two or more different chemical substances which are not chemically combined.
Air is a mixture because the components of air are not chemically combined together.
A mixture is a material made up of two or more different chemical substances which are not chemically combined. This mixture can be separated using physical method.
The composition of the air we breathe include the following;
Air is a mixture because the components of air are not chemically combined together.
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