Sources of oxygen are
(i) Photosynthesis by plants
(ii) Ozone decomposition and disintegration
(iii) Dissociation of oxides
(iv) In combined form as water
Sources of oxygen are
(i) Photosynthesis by plants
(ii) Ozone decomposition and disintegration
(iii) Dissociation of oxides
(iv) In combined form as water