Across
- 2. Microscopic plants and animals that float in sea water
- 6. To escape
- 7. Animals that suck in water with a filtering device and then eat the plankton the catch
- 8. The shedding of an animal's exoskeleton.
- 11. Animals that feed on dead or dying plants or animals
- 12. Animals that are eaten by other animals
Down
- 1. Animals that feed on living animals without causing the death of their host
- 3. Small water-filled tubes that are used by echinoderms for moving
- 4. The place where an organism lives
- 5. Animals with backbones
- 9. The rise and fall of the oceans and the seas caused by the moon
- 10. Animals that eat sea weeds only (and sometimes phytoplankton)