because of their internal structure
Echinodermata.
Sea stars also known as starfish, are in the class Asteroidea. They belong to the phylum Echinodermata. Also in this phylum are sea urchins, sand dollars and sea cucumbers.
Sea cucumbers are part of Phylum Echinodermata along with starfish, sea urchins, sand dollars, crinoids and brittle stars..
Sponges are in the group(phylum) Porifera. The phylum echinodermata are the starfish, urchins sea cucumbers, and sea lilies..
sea stars, sea urchins, sand dollars, and sea cucumbers.
That depends, obviously, on the species of Sea Urchin. All belong to the Phylum Echinodermata (along with sea stars and sea cucumbers) and to the Class Echinoidea. They are then divided into different orders, genera and species. That depends, obviously, on the species of Sea Urchin. All belong to the Phylum Echinodermata (along with sea stars and sea cucumbers) and to the Class Echinoidea. They are then divided into different orders, genera and species.
Echinodermata
Organisms in the phylum Echinodermata include sea stars, sea urchins, sand dollars, and sea cucumbers. These marine animals are characterized by their radial symmetry, spiny skin, and a water vascular system used for movement and feeding.
No; Echinodermata is the phylum of starfish and sea cucumbers. Sea squirts actually belong to the phylum Chordata, just like all vertebrates, including us! Their larva has a structure that's considered the early version of a backbone, explaining why they're classified that way; they're related to vertebrates.
Echinodermata i.e echinoderms - starfish, sea urchins, sea cucumbers
All poisonous, and spiked sea critters, including sea urchins, star fish, jellyfish, sea cucumbers, etc.
Deuterostomes that show radial symmetry in their adult form called phylum Echinodermata. Phylum Echinodermata are things like sea stars, sea urchins and sea cucumbers.