Question

Is the answer B or no

Which gas makes up 78% of earths atmosphere?

A. Methane.
B. Nitrogen.
C. Oxygen.
D. Carbon Dioxide.

Answer 1

The answer to this is Nitrogen so yes B is the correct answer. 

Answer 2

Nitrogen takes up 78% of the earth's atmosphere. Actually, most of the air we breathe is nitrogen. The others are:

oxygen: 21%

argon: 0.9%

carbon dioxide: 0.03%

There are a few other gases, but way to small to consider significant.

I hope this helps!
~kaikers