Why are decomposers important in the carbon and nitrogen cycles

As to why decomposers are important in the carbon and nitrogen cycles, well, they are. Decomposers, as their name strongly suggests, decompose matter, more specifically dead matter and waste materials. These decomposers break down the dead body of the once-living organisms and the living organisms' waste materials to their basic state. While in the process, the carbon is released as carbon dioxide. Nitrogen is also released in the process. Either they are both released into the atmosphere or are trapped on the ground. Some dead matters don't undergo decomposition due to certain factors which leads them to become fossil fuels and their compositions are released through human activities.