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Biology 21 Online
OpenStudy (anonymous):

Question 2.2. Which gas is found in the greatest abundance in the modern atmosphere? (Points : 3) oxygen helium hydrogen nitrogen

OpenStudy (forevershorty):

Nitrogen makes up 78% of our atmosphere, oxygen comes in second at 21%. The other 1% is made up of others like carbon dioxide, hydrogen, helium, argon and many others.

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