Question

____________ is a gas that makes up 78% of the earth's atmosphere.​

Answer 1

nitrogen

Step-by-step explanation:

It's a mixture of different gases. The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.S

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Answer 2

Nitrogen

Step-by-step explanation:

Nitrogen makes up 78% of the atmosphere, while oxygen makes up only 21% and other gases make up around 1%