Explain the general characteristics of aquatically well developed chordates.
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Characteristics of Chordata:
• Animals of Chordata, have a notochord in some stage of their life.
• Animals have nerve chord on the middorsal surface.
• They have pharangeal gill clefts, at some stage of life.
• The heart is present on the ventral surface
• Blood circulatory system is of closed type
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