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anonymous · Answer

I might be able to guess at some of these. I'm not so keen on the sealife stuff.
I know kelp photosynthesize, so that's probably right.

anonymous · Answer

I can't say I know every answer, but you can definitely rule each one out for every species. 

Barnacles do not have soft bodies. It is a carapace. This strikes out #5. 
Barnacles do not have gills. Strike out #7.
Barnacles do not have tube feet either. Strike out #10.

Do that for every species listed. Sorry I can't help much more.

Starfish definitely do not have shells or gills, I can tell you that!

anonymous · Answer

Thanks for your help :)

anonymous · Answer

I think #8 is hermit crab, actually.

anonymous · Answer

Yes sorry, I changed that one, I think you're right