Which statement best describes a part of the nitrogen cycle?
animals absorb nitrogen from the air they breathe and incorporate it into their tissues.
certain bacteria living in the roots of plants convert nitrogen to a form plants can use, and animals obtain their nitrogen by eating those plants.
certain bacteria convert nitrogen to a form animals can use, and animals obtain their nitrogen by inhaling this nitrogen.

Option B

Explanation:

The best part of the nitrogen cycle is that it assures that nitrogen is made available to the plants and animals present in the environment.

There are certain nitrogen fixing bacteria present in the soil (roots of the plant) that converts the nitrogen into the form by which it can be utilized by the plants.

This nitrogen present in the plants is consumed by the animals and this is how the animals obtain nitrogen.