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DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 2 The chemical substances which are rich from nutrients and used to maintain soil fertility are called fertilizers. They also produce harmful effects. They remain in the soil and spoil porous structure of the soil which is essential for plant growth. They also kill the soil organisms like earthworms. Earthworms burrows and loosens the soil and make it porous. Which of the following is a chemical fertilizer?

A) Cow dung      

B) Urea

C) Biological mass           

D) None of these