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Why is a microorganism an important part of soil?
A.
It helps to improve water infiltration.
B.
It can break down organic pollutants.
C.
It converts nitrogen in the air into nitrates used by plants.
D.
It is rich in nutrients, which is important for fertility.

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Answer 1

C.

Soil microorganisms (like nitrogen-fixing bacteria and nitrifying bacteria) convert atmospheric nitrogen into forms plants can use (ammonia, nitrites, nitrates), making them essential for plant nutrition.