A) carbon
B) sodium
C) phosphorus
D) magnesium
Correct Answer: A
Solution :
Carbon cycle has atmospheric phase as it is present in form of \[C{{O}_{3}}\] in atmosphere and dissolved \[C{{O}_{2}}\] in hydrosphere, carbonic and and bicarbonates in lithosphere as fossil fuels or carbonates and graphite in rocks. Phosphorus forms part of the sedimentary- cycle and is very important being the energy- carrier as ATP and part of nucleic acid (DNA and RNA). Magnesium, sodium, potassium etc., have a similar pathway of cycling involving the abioric and biotic phases. These elements usually cycle within the same ecosystem and in small quantities globally.
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