A) Useful: Creating food, decomposition. Harmful: Spoiling food, role in carbon and nitrogen cycle, sickness.
B) Useful: Creating food, decomposition, role in carbon and nitrogen cycle. Harmful: Spoiling food, sickness.
C) Useful: Creating food, role in carbon and nitrogen cycle. Harmful: Spoiling food, sickness, decomposition.
D) Useful: Creating food, role in carbon and nitrogen cycle, spoiling food. Harmful: Sickness, decomposition.
E) None of these
Correct Answer: B
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