Question

multiple - choice question
how do animals get the fixed nitrogen?
they breathe it in
they eat it
they fix it in the soil.
they die and decompose

Explanation:

Plants absorb fixed nitrogen from the soil. Animals, like the moose in the image eating plants, obtain fixed nitrogen by consuming these plants (or other animals that have eaten plants). Animals do not breathe in fixed nitrogen (they breathe in oxygen), they do not fix nitrogen in the soil (bacteria and some plants do nitrogen - fixing), and dying and decomposing is part of the nitrogen cycle but not how they get fixed nitrogen.

Answer:

They eat it.