6. Why does DNA condense during mitosis?

Look at the picture below . what does this picture represent ?

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

Are the earth's ocean floor and continents the same age geologically? why or why not?