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GAS CO2 N2

O2
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The above table shows the compositions of the atmosphere of planet X. Which of these gases are present in higher percentages on earth?

A.

CO2 and O2

B.

N2 and CO2

C.

CO2, O2 and N2

D.

O2 and N2

View answer & explanation

Correct answer is D

The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of other gases, too, such as carbon dioxide, neon, and hydrogen.

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