1. Group of arthropods including crabs, lobsters, and shrimps.

2. Coastal habitat with vegetation that tolerates high salt concentration.

3. Marine mollusk with two shells that is prized for its edible flesh.

4. Bottom of the ocean or sea.

4. Coastline where land meets the sea or ocean.

5. Water that contains a significant amount of dissolved salts.

6. Small marine crustacean that attaches itself to rocks or ship hulls.

6. Type of mollusk with a hinged two-part shell.

7. Hard protective outer covering of an oyster.

8. Solid mineral material forming part of the Earth's surface.

9. Enormous body of saltwater covering most of the Earth's surface.

10. Invertebrate animal with a soft body, usually enclosed in a shell.

11. Granular material composed of finely divided rock and mineral particles.

12. Hard, protective outer layer created by a marine organism.

13. Algae growing in the sea or on rocks below the high-water mark.

14. Mollusk having two shells.

15. Hard, smooth object produced within the soft tissue of a living shelled mollusk.

16. White crystalline substance used to season food.