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B_lintu t1_j4w4qh2 wrote

What is the porpoise of having no fins or have they not evolved having them yet?

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DaRedGuy OP t1_j4xr156 wrote

Their dorsal fin was modified into a dorsal ridge that is covered in varying rows of tubercles. These tubercles are used as a sensory organ, as well as to move through the water.

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