Life predominantly requires oxygen (O2) for survival due to its role as a terminal electron acceptor in biochemical processes, particularly in larger organisms like humans. While nitrogen (N2) is abundant and essential for the formation of proteins, not all life forms depend on atmospheric oxygen; some microorganisms find it toxic. The nitrogen cycle plays a crucial role in providing fixed nitrogen necessary for life. Understanding these distinctions clarifies the evolutionary adaptations of various organisms to their environments.
PREREQUISITESBiologists, ecologists, and students studying evolutionary biology or microbiology will benefit from this discussion, particularly those interested in the roles of oxygen and nitrogen in life processes.
