Answer:
The
carbon in the form of food travels to animals from plants through food chains.
In atmosphere the concentration of carbon dioxide is very low? only about 0.03%
to 0.04%. Therefore, if carbon dioxide is not circulated back to our nutrient
pool, there will be shortage of CO2 and plants will not be able to carry
out photosynthesis and the whole cycle will be disrupted. Combustion of fuel
also adds carbon dioxide in the atmosphere. Carbon thus cycles through physical
and biological activities.
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