Across
- 4. animals without backbones
- 10. a group of cells organized into a unit to perform a specific job in the body.
- 11. the regrowth of lost body parts.
- 13. mollusks with two shells that are held together by powerful muscles.
- 14. worm with a ribbon-like body, a mouth, and a gut
Down
- 1. needlelike skeletal materials inside sponges
- 2. worm with ringlike segments on the outside of their bodies.
- 3. long flexible appendages
- 5. spaghetti like worm with pointed ends
- 6. an iternal skeleton
- 7. bulblike suction structures lining the arms of an echinoderm.
- 8. cnidarian with a bowl-shaped body
- 9. mollusk with either a single, chambered shell or no shell.
- 12. cnidarian with a vase-shaped body