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Although _[blank]_ makes up 78% of the Earth's atmosphere, it is not directly usable by most living organisms.

carbon dioxide
nitrogen gas
phosphorus
water vapor

Respuesta :

cbalmer38

Nitrogen gas is the answer.

Hope this helps.

PewDiePie93

Although Nitrogen Gas makes up 78% of the Earth's atmosphere, it is not directly usable by most living organisms.

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