SPONGE

5. A flat cell that forms much of the outer surface of a sponge.
7. Small openings that allow water to enter the sponge.
8. A ring of tiny projections surrounding the flagellum that traps food particles.
9. A flexible protein fiber that forms part of the skeleton of some sponges.
10. A tubular cell that forms a pore through which water enters a sponge.
11. The jelly-like material between the outer and inner cell layers of a sponge.
13. The central body cavity through which water flows in a simple sponge.

1. A supporting framework that helps maintain the sponge's body shape.
2. A specialized collar cell with a flagellum that creates water currents and captures food.
3. A whip-like structure that beats to move water through the sponge.
4. Tiny openings through which water enters a sponge's body.
6. Another name for an amoebocyte-like cell capable of developing into other cell types.
12. The large opening through which water exits a sponge's body.