. A scientist was studying the effects of oil contamination on ocean seaweed. He thought that oil runoff from storm drains would keep seaweed from growing normally so he decided to do an experiment. He filled two aquarium tanks of equal size with water and monitored the dissolved oxygen and temperature in each to be sure they were equal. He introduced some motor oil into one tank and then measured the growth of seaweed in each tank. In the tank with no oil, the average growth was 2.57cm. The average growth of the seaweed in the tank with oil was 2.37cm. Based on this experiment: a. What was the question that the scientist started with? b. What was his hypothesis? c. Identify the independent variable, the dependent variable, and the experimental control(s). d. What did the data show? e. Can he be certain of his conclusion? How can he make his conclusion firmer?