From your own observations, what seems to be the optimal position of leaves on a tree? Why do you think this is so?

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

What is the relation ship between structure and function in an organism

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.