Which of the following has not been shown to cause cancer? A) sun
B) Radiation
C) viruses
D)salt

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

Explain how scientists use geologic time to determine the age of landforms.

How can an organ, such as the lungs, work for multiple body systems?