Question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Perischoechinoidea - Perischoechinoidea is a subclass of primitive sea urchins that were abundant in the Palaeozoic seas. However the great majority of species died out during the Mesozoic as the more advanced euechinoid sea urchins became common. Today only a single order the Cidaroida survives.Most fossil forms had multiple columns of ambulacral plates rather than the two rows found in all living species of sea urchin. They also lacked a perignathic girdle around the mouth.
Answer:
Animal