Write about the Division level' Classification of Bilateria.
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The cumetazoans other than Radiata, show organ level of organisation and are bilaterally symmetrical and triploblastic. The grade Bilateria includes two taxonomic levels called Division. Division 1 Protostomia (Protor first stomium mouth): Protostomia includes the eumetazoans in which the embryoni Nastopore develops into mouth. This division includes three subdivisions wamely coelomata, pseudococlomata and schizococlomata. Division 2 Deuterostomia (deuteron secondary, stomium: mouth): Eumemed from or near the Miastopore and the mouth is formed away from the blastopore. It includes only one subdivision Enterococlomata. They have a true coelom called enterocoel formed from the archenteron.
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