Sponges Crossword

5. The release of gametes or eggs into the water.
7. A marked change in form during embryological development.
10. An organism that lives attached to the bottom or to a surface.
11. Free-swimming larva with flagellated cells in the front half of the larva and non-flagellated cells in the other half of the larva.
13. An animal that lacks a backbone.
14. The resistant fibers of sponges.
15. Having no symmetry.

1. Animals that feed on particles suspended in the water.
2. Flagellated food-trapping cells of sponges.
3. Any of the small calcareous or siliceous bodies embedded among the cell walls of sponges.
4. Suspension feeders that actively filter food particles.
6. Pore bearing.
8. Cells that secrete spicules and spongin. Also known as amebocytes.
9. A large opening in many sponges.
12. The tube-like cells of sponges that each form a pore.