Respuesta :

The atmosphere is made up of 21% oxygen, 78% nitrogen, 0.9% argon, and 0.03% carbon dioxide with very small %s of other elements. 
BNHA0FREAK

Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent.