Echinodermata

2. Hard plates forming the endoskeleton of echinoderms, providing support and protection.
5. Class of echinoderms, including sea cucumbers, with elongated bodies and leathery skin.
12. The upper surface of an echinoderm's body, away from the mouth.
14. Cup-like structure in crinoids that houses the vital organs.
16. Class of echinoderms, including brittle stars, with a central disc and long, slender arms.
17. Threat to echinoderm populations due to excessive harvesting for food or the aquarium trade.
18. Feeding strategy in which echinoderms, like crinoids, use tube feet and arms to filter plankton from the water.
19. The ability of echinoderms, particularly starfish, to regrow lost body parts.

1. A hydraulic system in echinoderms that powers tube feet for locomotion, feeding, and respiration.
3. Flexible, fluid-filled appendages in echinoderms used for locomotion, feeding, and other functions.
4. Class of echinoderms, including starfish, with a central disc and radiating arms.
6. Class of echinoderms, including sea urchins and sand dollars, with spherical or flattened bodies enclosed in a test.
7. The disturbance of sediment by echinoderms, particularly sea cucumbers, influencing nutrient cycling and sediment structure.
8. Sieve-like opening on the aboral surface of echinoderms that allows water to enter the water vascular system.
9. A body plan with five-fold radial symmetry, commonly seen in adult echinoderms.
10. Tube-like structure in sea cucumbers that expels sticky threads or toxins as a defense mechanism.
11. Feeding strategy in which echinoderms, like sea urchins, graze on algae and detritus.
13. Phylum of marine invertebrates characterized by a spiny endoskeleton, radial symmetry, and a water vascular system.
15. Class of echinoderms, including sea lilies and feather stars, with a cup-like calyx and feathery arms.