All atoms of the same element have the same

What problem would a person have if the nucleic acid in one of his or her cells were damaged?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

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 !