Across
- 1. A more complex sponge body formed with a folded wall that increases the surface area of filtering water.
- 4. Tiny pores on the surface of a through which water enters the body
- 9. Permanently attached to a surface unable to move freely.
- 10. organisms that drift in water, often serving as a food source for larger animals .
- 12. A fibrous protein that forms a soft flexible skeleton in some sponges.
Down
- 2. Capable of shortening or contracting
- 3. The central cavity within a sponge where water is collected after passing through the osita.
- 5. The simplest form of a sponge.
- 6. The large opening of the top of sponge through which water.
- 7. Feeder AN organism that feeds by filtering out plankton or other organisms from the water.
- 8. An immature, often mobile stage of life cycle of many animals.
- 11. Small, needle- like structures made of calcium carbonate or silica that form the skeletal support of most sponges.