Which of the following adds/add nitrogen tothe soil ?1. Execretion of – McqOptions

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1.	Which of the following adds/add nitrogen tothe soil ?1. Execretion of urea by animals2. Burning of coal by man3. Death of vegetationSelect the correct answer using the codes givenbelow.
A.	1 only
B.	2 and 3 only
C.	1 and 3 only
D.	1, 2 and 3
Answer» D. 1, 2 and 3

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