Botany - Animal Kingdom Question with Solution | TestHub

Echinoderms are invertebrates with spiny skin, water vascular system and a simple nervous system. This phylum is majorly a marine group and found in all oceans. They are not found in freshwater or terrestrial surfaces. There are around 7000 species of this group which found exclusively in marine environments. The other three phyla habitat various ecologies such as freshwater, terrestrial environments and marine waters.