Unlike bony fish, cartilaginous fish lack?
| August 8, 2021 | education
They do not have a so-called swim bladder. It is also worth knowing that they also lack gill covers (this just does not apply to chimeras). One of the hallmarks of bony fish is that they have paired fins. They also have paired nostrils. It is believed that such fish appeared on our planet four hundred and twenty-five million years ago.
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