Echinoderm is a common name for about 6 000 living species that live at all depths in all of the oceans of the world . These include:Starfish, sea-cucumbers and sea-urchins.Starfish have a mouth surrounded by 5 arms. At the ends of the arms are fleshy tube feet which the starfish uses to cling to things and to crawl about.Sea-urchins have spines that are very well developed.Echinoderms have simple nervous and circulatory systems.
No comments:
Post a Comment