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There’s 78 percent of this in the air.

Retry Correct Incorrect Most of the earth’s air isn’t actually made up of oxygen; even though humans need it to survive. About 78 percent of the atmosphere is actually made up of nitrogen. Too much oxygen can make people feel sick.

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David Zawila/Unsplash

David Zawila/Unsplash

There’s 78 percent of this in the air.

• oxygen
• carbon
• nitrogen
• hydrogen