The hagfish are the only known vertebrate that is iso-osmotic.

Name: The hagfish are the only known vertebrate that is iso-osmotic.
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The hagfish is the only known vertebrate that is iso-osmotic, meaning their body fluids have the same concentration of solutes as the water they are living in. This is in contrast to most other vertebrates, which are hypo-osmotic or hyper-osmotic, meaning their body fluids have a lower or higher concentration of solutes than the surrounding water, respectively.

The Hagfish Are the Only Known Vertebrate That Is Iso-Osmotic