How do most animals obtain nitrogen to build their body proteins? Responses

A. They eat nitrogen-containing compounds found in the soil.

B. They breathe in free nitrogen directly from the air.

C. They are able to convert nitrogen in the soil into usable compounds.

D. They eat plants after bacteria have turned nitrogen into a usable form.

A. They eat nitrogen-containing compounds found in the soil.

Explanation:

Animals get the nitrogen they need by eating plants or other animals that contain nitrogen. When organisms die, their bodies decompose bringing the nitrogen into soil on land or into ocean water. Bacteria alter the nitrogen into a form that plants are able to use.

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