Identify the correct statements with reference to the biogeochemical cycle. Choose the correct answer from the options given below:
1.It involves both physical and biological processes.
2.It is also referred to as a material cycle or nutrition cycle.
3.Of all the biogeochemical cycles, the nitrogen cycle is the most important as nitrogen makes up 78 percent of the atmosphere.
4.In the biogeochemical cycle the movement of materials is unidirectional.
A1, 2 and 3
B1 and 2
C2 and 3
D1, 2, 3 and 4
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