BI-1921
Carbon cycle and carbon sinks
Biology · Secondary 4 · Medium · Carbon cycle and carbon sinks
The diagram of a carbon cycle (not shown) indicates that plants transfer 50 gigatonnes of carbon per year to the atmosphere by respiration, and animals transfer 30 gigatonnes per year by respiration. What is the total mass of carbon moved to the atmosphere by respiration each year?
- 20 gigatonnes
- 50 gigatonnes
- 80 gigatonnes
- 150 gigatonnes
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