@P E Dant,
Shipwreck
2. The Kraken.
https://i.ytimg.com/vi/Pd5VaGILAo8/maxresdefault.jpg
3. Sea urchins
4. Sea sponges
5. Remoras, They hitch rides on sharks and other fish with a suction cup on their head.* ....(nice to see)
6. Desis Bobmarleyi intertidal spider - It builds air chambers from its silk
7. Argonaut octopus--builds shell and drifts in the ocean. *
8. Stonefish. It is a very dangerous fish; it is the most venomous fish in the world.
9. Sea-grass meadows
10. Sunfish, another bizarre fish