What information does the atomic mass of an element provide? a the number of isotopes
b the difference between the number of protons and electrons c the number of protons and neutrons in an atom d the sum of electrons and protons in an atom

Which geologic feature would most likely be represented by contour lines john far apart from one another? a cliff a hill a plain a valley

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline.which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes