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Which of the following adds/add nitrogen to the soil?1. Excretion of urea by animals2. Burning of coal by man3. Death of vegetation Select the correct answer using the code given below.

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Which of the following adds/add nitrogen to the soil?<br />1. Excretion of urea by animals<br />2. Burning of coal by man<br />3. Death of vegetation Select the correct answer using the code given below.






 
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