How do the cells get to be so different from each other?

What word is used to describe differences of individual organisms

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 importance of the mind as a part of the body is an example of: