This PowerPoint presentation is the first of four in a unit titled, "Comparing Living Things", which includes the lessons, "Is It Living or Nonliving?", "How Are Living Things Classified?", "How Are Animals Classified?", and "How Are Plants Classified?". These are all based upon information from the fifth grade Scott Foresman Science textbook. This particular PowerPoint presentation contains eleven slides that present students with information about life processes, viruses and bacteria, and cells. This PowerPoint presentation, as well as the others in the series, were designed by Marie Wimsett.