Question

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questions on this quiz are based on information from
earth science: nitrogen cycle
10 question quiz
2/10

1. what living organisms play an important role in helping nitrogen change states in the soil?

reptiles
algae
mammals
bacteria
fish
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Explanation:

Bacteria in the soil are crucial for the nitrogen - cycle. They can fix atmospheric nitrogen into a form usable by plants (nitrogen - fixation), convert ammonia to nitrites and nitrates (nitrification), and also carry out denitrification. Reptiles, algae, mammals, and fish do not play a direct role in changing nitrogen states in the soil.

Answer:

D. Bacteria