The reason it's so important is because say you were doing push ups. Most people hold their breath will doing any exercise, and that is really bad for you. The reason why you have to exhale completely is because if you don't, you can/will pass out because your brain won't have enough oxygen to pass down for your muscles to work properly.
After the forest fire,the burnt wood will be fertilized by microbes which consider as decomposer in the food chain.It doesn't olny decompose dead animals but also organic and inorganic resources.
