What makes it easy for scientists to gather so much information about the Intertidal zone?

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

This is the interaction of two organisms where one is and the other is neither nor harmed.

Where is muscle tissue found in the body?