Name the three energy roles that organisms fill in an ecosystem.

What are the four basic classes of organic molecules how do they differ structurally and functionally

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

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?