Key Points:
1. Photosynthesis involves the leaf absorbing light energy and combines CO2 with H2O to make C6H12O6 and O2
2. The release of oxygen is classified as excretion, the release of metabolic waste.
3. The process of respiration is the second excretion example. C6H12O6 -> ATP + CO2 + H20
4. In that process the CO2 is the waste product, so the plant excretes CO2 while respiring and excretes O2 during photosynthesis.
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