What does it mean if an experiment is replicable? why is it important that experiments be replicable?

Which sequence correctly shows the path of carbon dioxide during repiration?

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

Plz ! ive been stuck on this forever