Final answer:
Decomposers break down organic matter and release nitrogen compounds, which are essential for plants to synthesize proteins.
Step-by-step explanation:
Decomposers play a crucial role in the nitrogen cycle by breaking down organic matter and releasing nitrogen compounds back into the environment. When plants and animals die, decomposers like bacteria and fungi decompose their remains, releasing nitrogen in the form of ammonia. This ammonia is then converted into nitrites and nitrates by nitrifying bacteria, which can be taken up by plants and used to synthesize proteins. Ultimately, decomposers ensure that nitrogen is recycled and available for use by living organisms.
Learn more about Decomposers in the nitrogen cycle