Aproperty of matter describes its ability to change into different substances

Which of the following is an example of this type of co-evolution

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

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.