What are two ways you know a chemical reaction has taken place?

What causes the phospholipids to organize themselves the way they do

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

Diffusion and osmosis are forms of passive transport