Without precipitation, there will be no enough water for your daily uses such as water for drinking, agriculture and so on. Air currents also have an effect on us as we rely the air currents in travelling in the bodies of water. Plus, air curents have an effect on the weather too.
Sharks, just like any other fish, develops gills to breath underwater. Their gills, act like a filter to filter out the oxygen with the water.
Most of the fighting was trench warfare. The eastern front was fought in central and eastern europe and was one of the main places where ww1 took place
No they would not have went to africa