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M: +2.00/-0.50

Which of the following adds/add nitrogen to the soil?

1. Excretion of urea by animals

2. Burning of coal by man

3. Death of vegetation

Select the correct answer using the codes given below :

I.A.S. (Pre) 2013

[Earth - Tropics, Volcanoes, Tides, cyclones, Corals ETC. Part 8]
A
B
C
D

EXPLANATION

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