Chose the best answer the sum of the coefficient the reactant of the reaction below 4al+3o2-2al2o3 is
A 7
B 4
C 6
D 2

Enzymes affect the reactions in living cells by changing the

Why is retrograde motion an apparent motion

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 !