why are echinoderms animals
Starfish belong to a group or phylum of animals called echinoderms. This means spiny skinned in Greek. Echinoderms live in salt water only. They sgenerally have five arms and dwell at the bottom of oceans' levels.There are around 6000 species of echinoderms.tarfish belong to a group or phylum of animals called echinoderms. This means spiny skinned in Greek. Echinoderms live in salt water only. They sgenerally have five arms and dwell at the bottom of oceans' levels.