| A | B |
|---|
| Eukaryotic, multicellular heterotrophs whose cells lack cell walls | Animals |
| Animals that are permanently attached to one spot | Sessile |
| Free moving stage in an animals lifestyle | Motile |
| A hollow ball of cells | Blastula |
| An opening that develops at the point where cells of the blastula move inward to form the cell layers of the gastrula | Blastopore |
| Animals with backbone | vertebres |
| Animals without a backbone | invertebrates |
| The opening at the top of a sponges sac | Osculum |
| Cells in a sponge's body that supply nutrients to other cells and remove wastes | Ambebocytes |
| A network of protein fibers in a sponge | Spongin |
| Tiny needlelike structures made of silicon dioxide | Spicules |
| A dormat mass of sponge amebocytes surrounded by protective layers of spicules | Gemmule |
| An individual organism capable of producing both egg and sperm | Hermaphrodite |
| Body parts that radiate from a central point | Radial Symmetry |
| Lack of body symmetry | Asymmetry |
| A sessile, tubelike form of a cnidarian with a mouth on the dorsal surface and tentacles that point upward | Polyp |
| a usually motile, bell shaped form of a cnidarian with a mouth on the ventral surface and tentacles pointing downward | Medusa |
| The stinging organelles of a cnidarian | Nematocyst |
| Free-swimming larva of a medusa | Planula |
