Aprocess in which substances are transported across a plasma membrane with the concentration gradient with he aid of carrier (transport proteins; does no require the use of energy.

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.

Where substance is produced during cellular respiration

Tides that occur during the new and full moons