Life evolves to adapt to its environment, with oxygen being a critical element for many organisms, particularly larger ones like humans, due to its role as an efficient terminal electron acceptor in biochemical processes. However, not all life forms require oxygen; some microorganisms thrive in anaerobic conditions and can find oxygen harmful. Nitrogen is also essential for life, as it is a key component of proteins and must be "fixed" from atmospheric N2 to be utilized by living organisms. The nitrogen cycle plays a crucial role in making nitrogen available for biological processes, highlighting the importance of both oxygen and nitrogen in the survival of different life forms.
