write four important features of chordates
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A. Notochord, or a rod of vacuolated cells, encased by a firm sheath that lies ventral to the neural tube in vertebrate embryos and some adults.
B. Hollow nerve cord that lies dorsal to the notochord
C. Pharyngeal pouches
D. Endostyle - elongated groove in the pharynx floor of protochordates that may develop as the thyroid gland in chordates
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Important features of chordates are as follows
1) Presence of Notochord
2) Central nervous system is dorsal, Hollow and single
3) Heart is ventral
4) Pharynx perforated by Gill slits
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