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Question
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 code given below.
Options:
A .  Only 1 and 3
B .  1, 2 and 3
C .  Only 1
D .  Only 2 and 3
Answer: Option A
Answer: (a)
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