What dose the oxygen produce in photosynthesis comes from

Oxygen is what trees produce and is the stuff humans breathe, trees use carbon dioxide as well as photosynthesis to produce oxygen

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explanation:

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ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg