Which characteristics do all bony and jawless fish have in common? Check all that apply. backbone swim bladder scales gills bony skeleton

1) They have a notocorda that serves as support through the back of the fish.

2) Gill bags. These organs are responsible for filtering the oxygen in the water.

3) A pineal eye that is sensitive to light.

4) A cartilaginous skeleton.

Explanation:

the correct answer is b