I-oxygen ecocekileyo ingaveliswa ngeendlela ngeendlela. ngokwendalo, izityalo zisebenzisa ukukhanya kwelanga xa zivelisa i-oxygen, i-carbon dioxide (enye i-gas) kunye namanzi. Le nkqubo ibizwa ngokuba yi-photosynthesis. Uninzi lwe-oxygen esemoyeni yenziwe nge-photosynthesis. I-Oxygen isenokwenziwa ngabantu, besebenzisa inkqubo ekuthiwa yi-electrolysis. Kule nkqubo, umbane ihamba ngamanzi. Zitsho iimolecules zamanzi ziqhekeke zikhuphe i-oxygen kunye ne-gesi i-hydrogen.