The element necessary for respiration is oxygen. Oxygen is vital for most living organisms as it plays a crucial role in cellular respiration, the process by which cells convert glucose and other nutrients into energy. This energy is essential for maintaining life, allowing organisms to grow, reproduce, and perform various biological functions. In aerobic respiration, oxygen is used to produce adenosine triphosphate (ATP), the energy currency of the cell. The availability of oxygen is one of the key factors influencing the survival and distribution of life forms on Earth.