That is correct. All fish have backbones. Jellyfish, do not.so jellyfish aren't fish?
They are in the phylum Cnidaria, as mentioned above.
Coral and jellyfish are both in the phylum Cnidaria, making them close “cousins”. However, they are NOT the same thing.
Both coral and jellyfish have something called radial symmetry, which is their defense mechanism that they use for their tentacles. This is the mechanism that releases the venom from their tentacles.both coral and jellyfish have little stinging things (i forget what called) so i think that’s why they are Cnidarians? @PheonixKingZ can help me out bc i don’t really know coral very well
Both coral and jellyfish also have sac-like digestive cavities, that they use to break down their food.
Just to recap: Both are in the same phylum, and they are very closely related, but they are not the same.