A.Notochord, ventral nerve cord, dorsal heart
B.Notochord, dorsal tutular nerve cord, pharyngeal slits
C.Notochord, dorsal tubular nerve cord open circulatory system
D.Notochord, double solid ventral nerve cord, red blood cells
A.Notochord, ventral nerve cord, dorsal heart
B.Notochord, dorsal tutular nerve cord, pharyngeal slits
C.Notochord, dorsal tubular nerve cord open circulatory system
D.Notochord, double solid ventral nerve cord, red blood cells