what is air?
your name is Melanie na? I'm her little bro she went to school!
her name is shifat !
but I call her shifu!
she is 14years old!
she added you in her friends list!
and you forget her!!!
how??
(sorry my Eng is not so good!)
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Air is the invisible mixture of gases that surrounds the Earth. Air contains important substances, such as oxygen and nitrogen, that most species need to survive. ... Standard Dry Air is made up of nitrogen, oxygen, argon, carbon dioxide, neon, helium, krypton, hydrogen, and xenon
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