Question

multiple - choice question
why are bacteria so important to the nitrogen cycle?
because they change the form of the nitrogen into a usable resource
because they eat the nitrogen
because they release the nitrogen back into the atmosphere
bacteria are not an important part of the nitrogen cycle

Explanation:

Bacteria play a crucial role in the nitrogen - cycle by converting nitrogen into a form that plants can use. They fix atmospheric nitrogen, convert ammonia to nitrites and nitrates, and perform denitrification. They do not eat nitrogen in a simple sense, releasing nitrogen back into the atmosphere is just one part of their role, and they are indeed important for the cycle.

Answer:

Because they change the form of the nitrogen into a usable resource.