Answer :

dontcare01

Answer:

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:

emmagirl08

Answer:

Gills

swim bladder

scales

Explanation:

i don't know though

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