Write down four main characters of chordates.
Main characteristics of chordates:
(i) They have a dorsal, hollow, tubular nerve cord.
(ii) Notochord is present that is ventral to the nerve cord.
(iii) They possess paired gill-slits in the pharynx.
(iv) They have a ventral heart with dorsal and ventral blood vessels and closed blood vascular system.
Examples: Salpa and Herdmania.
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