JUST GET IT ITS GOOING BE FOR 10 or 50 POINTS

Ronald wants to see if a new shower cleaner works better in removing soap than his old cleaner. he uses the new cleaner on one half of the shower tiles and his old cleaner on the other half. identify the independent and dependent variables in this experiment. enter your answer in the space provided.

Which description provides the best objective summary of the article in the passage?

Wich level of organization includes all the other levels or organizations