BI-1852
Carbon cycle and carbon sinks
Biology · Secondary 4 · Medium · Carbon cycle and carbon sinks
In a carbon cycle diagram, 90 gigatonnes of carbon per year move from plants to the atmosphere by respiration. Animals respire 30 gigatonnes per year and decomposers respire 50 gigatonnes per year. What is the total mass of carbon returned to the atmosphere by respiration each year?
- 120 gigatonnes per year
- 140 gigatonnes per year
- 170 gigatonnes per year
- 190 gigatonnes per year
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