Name the three processes in which oxygen is used.

(N/A) The three primary processes in which oxygen is used are:
$1$. Combustion: Oxygen is essential for the burning of fuels.
$2$. Respiration: Living organisms use oxygen to break down glucose and release energy.
$3$. Formation of oxides of nitrogen: Oxygen reacts with nitrogen during high-temperature processes (like lightning or internal combustion engines) to form nitrogen oxides.