Which immune system cells act as hungry scavengers that trap and digest worn-out cells?

In what for do plants utilize nitrogen? why do they need nitrogen?

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.

Drag each label to the correct location on the chart. match the function to the type of tissue