AP BIOLOGY

Detailed explanation-1: -The composition of gases in the atmosphere are: nitrogen is about 78% and oxygen is 21% and the remaining 1% mostly has argon, carbon dioxide and other gases like hydrogen, helium, neon, krypton, xenon, methane, ozone and water vapour. Apart from these gases, tiny dust particles are also present in our atmosphere.

Detailed explanation-2: -The most abundant naturally occurring gas is nitrogen (N2), which makes up about 78% of air. Oxygen (O2) is the second most abundant gas at about 21%. The inert gas argon (Ar) is the third most abundant gas at 0.93%.

Detailed explanation-3: -Air is mostly gas 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.

Detailed explanation-4: -In fact, the troposphere contains three-quarters of the mass of the entire atmosphere. The air here is 78% nitrogen and 21% oxygen. The last 1% is made of argon, water vapor, and carbon dioxide.