The three stable (i.e., nonvariable) gases in the atmosphere, in order of abundance from most to least, are

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The three stable gases in the atmosphere (i.e., those that do not vary in abundance) are nitrogen (78%), oxygen (21%), and argon (0.93%). Carbon dioxide is present in much smaller amounts (0.04%), while the abundance of any one of these gases does not depend on the presence of another, so the correct order is C) nitrogen, oxygen, and argon.

The Three Stable (I