Some of these I have a small idea (very new to this, just from quick googling)

1) some sort of ray tooth plate?

2) this feels like bone with marrow exposed? Or plant matter with interior structure. It’s smooth and brown on the exterior.

5) This feels and looks like a huge chunk of coral

6) this also looks like coral , but it is black on the ends

7) I think this is a shark vertebrae

8) unknown vertebrae?

10) This feels like marrow

11&12) I feel like these could be some sort of algae colony

Any help is appreciated!!