Answer:
:Fixation - Fixation is the first step in the process of making nitrogen usable by plants. Here bacteria change nitrogen into ammonium. Nitrification - This is the process by which ammonium gets changed into nitrates by bacteria. Nitrates are what the plants can then absorb.
Answer:
Bacteria perform nitrogen fixation.
More bacteria perform nitrification.
Nitrogen, in usable form, is taken up by plants and assimilated into their proteins (becoming part of the plant).
An animal eats the plant and the nitrogen becomes part of the animal’s proteins.
An animal dies and decomposes, or excretes waste, returning the nitrogen to the soil.
