This cell is made using Styrofoam, construction paper, and fuzzy balls. Since the objects were so hard to label with numbers, the key ( see below ) was made very differently. Notice that it was acceptable to use a circular piece of Styrofoam, as long as the cell wall ( green construction paper ) made the cell resemble a square shape necessary for plants.
This key is different because instead of using numbers or descriptions, the student attached an example of each object.