Which of the Following Locations is the Reservoir for Nitrogen

Question

Which of the following locations is the reservoir for nitrogen in the nitrogen cycle?
A)atmosphere
B)sedimentary bedrock
C)fossilized plant and animal remains (coal, oil, and natural gas)
D)plant and animal biomass
E)soil

Accepted Answer

The atmosphere is the reservoir for nitrogen in the nitrogen cycle. Nitrogen gas (N2) makes up 78% of Earth's atmosphere, and this is the primary source of nitrogen for most living organisms. Nitrogen fixation by bacteria and lightning converts N2 to forms that can be used by plants, and the nitrogen then cycles through the food chain before eventually being returned to the atmosphere through denitrification.