Explain why microorganisms such as bacteria are critical components of the nitrogen cycle. They deliver useable forms of nitrogen directly to animals. They destroy other microorganisms that would otherwise use up the nitrogen in the soil. They convert non-usable forms of nitrogen to usable forms. They filter nitrogen from the water that is used to nourish plants.

They convert non-usable forms of nitrogen to usable forms.

Explanation:

Organisms such as plants cannot use the atmospheric nitrogen form N2 which is abundant. So bacterias are key players because there are special nitrogen fixing bacteria that convert N2 to usable forms of nitrogen such as ammonia (NH3).

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