| A | B |
|---|
| Spicules | Provides support and protection in sponges |
| Ectoderm | The outer layer of cells, becomes epidermis |
| Radial Symmetry | Organism can be divided into equal halves by passing a plane thorugh the central axis of an animal in any direction |
| Porocytes | Cells through which water passes into sponges |
| Mesoderm | The middle layer of cells, becomes most organ systems |
| Endoderm | The inner layer of cells, becomes digestive system |
| Polyp | A vase shaped sessile body form found in cnidarians |
| Collar cells | The flagellated cell lining the internal cavity of a sponge; takes in food |
| Lateral | The sides of an organism |
| Amoebyocytes | Cells in sponges that transport food around |
| Medusa | A bell shaped, free swimming body form found in cnidarians |
| Bilateral Symmetry | Organism can be divided into equal halves only along a single plane |
