Pls help i’m between A and D I NEED THIS ASAP i’ll give branliest

In what for do plants utilize nitrogen? why do they need nitrogen?

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

What’s the student’s scientific question