Starfish are not in anyway fish. But they are related to vertebrates. Vertebrates are chordates and star fish, more correctly called sea stars, are echinoderms which share much in common wihh chordates.
Bruh what do you guys mean starfish is literally not a vertebrate ints a "IN"vertebrate if you answer starfish i- you will get it wrong only when it's a "IN"vertebrate