In order for the parts in a system to work correctly, the parts must be arranged or built upon in a particular order. what is the correct order of the parts of a human body system from simplest to most complex? a. organ system b. organ c. cell d. tissue

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