Characteristics all bony and jawless fish have in common are:-
- Gills, Scales, swim bladder, and backbone.
- Both are cold-blooded also called ectoderms.
- This means that they can't control their body temperature internally.
- Their body temperature is similar to the temperature of their outside environment.
What are bony fishes?
- Osteichthyes are cold-blooded vertebrates that breathe through gills and use fins for swimming.
- Bony fishes share several distinguishing features: a skeleton of bone, scales, paired fins, one pair of gill openings, jaws, and paired nostrils.
- They can be contrasted with the Chondrichthyes, which have skeletons primarily composed of cartilage.
To know more about Chondrichthyes here
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