The earth's atmosphere, which we refer to as air, is a mixture of approximately a. $78 \%$ oxygen, $21 \%$ nitrogen, and less than $1 \%$ carbon dioxide.
b. $78 \%$ nitrogen, $21 \%$ oxygen, and less than $1 \%$ argon.
c. $78 \%$ oxygen, $21 \%$ carbon dioxide, and less than $1 \%$ helium.
d. $78 \%$ oxygen, $21 \%$ water vapor, and less than $1 \%$ ozone.

Question

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The Answer of The earth's atmosphere, which we refer to as air, is a mixture of approximately a. $78 \%$ oxygen, $21 \%$ nitrogen, and less than $1 \%$ carbon dioxide.
b. $78 \%$ nitrogen, $21 \%$ oxygen, and less than $1 \%$ argon.
c. $78 \%$ oxygen, $21 \%$ carbon dioxide, and less than $1 \%$ helium.
d. $78 \%$ oxygen, $21 \%$ water vapor, and less than $1 \%$ ozone.

The Earth's Atmosphere, Which We Refer to as Air, Is 78%78 \%78%

The Earth's Atmosphere, Which We Refer to as Air, Is $78 \%$