When is the classification division used

Average annual precipitation and are the two major features that define the biomes on earth.

Which of the following is not an example of conflict between related individuals?

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