Which of the following is an example of mutualism?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

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

As a small change in a person's dna can cause a genetic disorder