4. Which of these are vestigial structures? A. The wings of a butterfly
B. The hip bones found in some species of snake
C. The thick fur and layer of fat of some mammals in cold climates
D. The sharp spines of a cactus

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 !