How does the nitrogen cycle differ from the carbon and oxygen cycles?

A Nitrogen never becomes incorporated into living things unlike carbon and oxygen which are required for the formation of sugar

B Most organisms cannot use nitrogen directly from the atmosphere, so it must combine with other elements to form usable nitrogen compounds.

C Animals breathe nitrogen directly from the air, so they are not dependent on plants releasing it as a byproduct of photosynthesis.

D Organisms use nitrogen to build proteins and other complex molecules unlike carbon and oxygen which are never incorporated into living things.