Regarding Phylum - Hemichordata : it consists of marine animals
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This phylum consists of a small group of worm like marine animals with organ system level of organisation.Respiration in this organisms takes place by gills. Circulatory system is of open type. Excretory organ is proboscis gland .Brain is present in form of nerve ring in this it's example are Balanoglossus and Saccoglossus .There bodies are cylindrical and composed of anterior proboscis, a collar and a long trunk. Respiratory pigment vanadium is present in their blood .
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