Even though Earth's atmosphere is around 75% Nitrogen gas, explain why animals (and most plants) are unable to use that
nitrogen as is:
I need help please!!!

Although the majority of the air we breathe is N2, most of the nitrogen in the atmosphere is unavailable for use by organisms. This is because the strong triple bond between the N atoms in N2 molecules makes it relatively unreactive. However organisms need reactive nitrogen to be able to incorporate it into cells.

your answer is "the 1950's"

within 30 of the equator hope this