I have no idea what to do please help me quickly!

1. list three scientific reasons cockroaches may fly.

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?