4. It is very important for man to be free of , , , for his survival as well as saving the world. (fire and ice). Class 10​

Conclusion if that's an answer.

Afirefighter is a rescuer extensively trained in firefighting, primarily to extinguish hazardous fires that threaten life, property and the environment as well as to rescue people and animals from dangerous situations.  just cut some parts to make them shorter and add some of your facts or what describes them most. or what they are supposed to do.