Biology — Carbon Cycle
Carbon flow through photosynthesis, respiration, decay and combustion.
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digraph CarbonCycle {
rankdir=LR;
node [shape=box, style=rounded];
Atmosphere [label="Atmospheric CO2"];
Atmosphere -> Plants [label="photosynthesis"];
Plants -> Atmosphere [label="respiration"];
Plants -> Animals [label="feeding"];
Animals -> Atmosphere [label="respiration"];
Plants -> Soil [label="decay"];
Animals -> Soil [label="decay"];
Soil -> Fossils [label="burial"];
Fossils -> Atmosphere [label="combustion"];
}