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12.Ecosystem
normal
The reservoir pool of carbon is
A
Air and water
B
Fossil fuels
C
Rocks
D
All of these
Solution
(d)Carbon is present in the abiotic environment in following forms $(i) $ $CO_2$ in air or atmosphere $ (ii) $ Dissolved $CO_2$ or carbonic acid and bicarbonate in water or hydrosphere $(iii)$ Carbonates and graphite in the rocks.
Standard 12
Biology