Can someone me with question 6 and check if 4 and 5 are correct : ) asap

Is a hamster and guinea pig part of the same species ?

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 similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?