Why are the rhizobium bacteria beneficial to plants?

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

Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%

Ineed / the answer on this question you!