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What can be used to measure primary productivity in an ecosystem?(1 point)
carbon dioxide consumption
sugar consumption
oxygen consumption
water consumption
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carbon dioxide consumption
Reason: Primary productivity is the rate of photosynthesis (carbon fixation), so CO2 uptake by producers indicates productivity. Oxygen consumption measures respiration (not photosynthesis), and sugar or water consumption are not direct measures.
Reason: Primary productivity is the rate of photosynthesis (carbon fixation), so CO2 uptake by producers indicates productivity. Oxygen consumption measures respiration (not photosynthesis), and sugar or water consumption are not direct measures.
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