The number 4, as soon as tonight .

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

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.

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?