explain with an activity that carbon dioxide and water are necessary for photosynthesis
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the Past
With advent of life on Earth, the process of photosynthesis started. Since the concentration of oxygen was negligible, first photosynthesis took place using hydrogen sulfide and organic acid in sea water. However, the level of these materials was not sufficient to continue photosynthesis for long and therefore photosynthesis using water evolved. This type of photosynthesis using water resulted in liberation of oxygen. Consequently, oxygen concentration in the atmosphere started to increase. This endless cycle made Earth rich in oxygen that could support the present oxygen-dependent ecosystem.
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