John is experiencing severe headaches that start just before orgasm. he is most likely

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.

Match each symbol with its description.

Some substances but not other can cross the (blank) membrane of a cell