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B
Nitrifying bacteria
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C
Nitrogen fixer
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D
Both (A) and (C) correct
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Solution
The correct option is A Parasite Klebsiella pneumonia is a bacteria which a parasite lives in the human intestine but does not cause any harm. If it goes in other parts of the body when the person is already having a disease and is weak it can cause pneumonia, infect wound or blood and other severe problems.