The diagram below shows the exchange of carbon on Earth. EXCHANGE OF CARBON ON EARTH
Fossil-Fuel
Decay of
Burning Land Use X Y Residues
Sea-Surface
Gas Exchange
Net Ocean
Uptake
Biological
Pumping
Circulation
Geological
Reservoir
Which biological processes are represented at X and Y in the diagram?
O X: decomposition: Y: fermentation
O X: photosynthesis: Y: cellular respiration
X: cellular respiration: Y: decomposition
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