Which one of the following features is present in some stage of the life history of all chordates? (UP-CPMT 2000)
A. Blood flowing forward in dorsal blood vessel
B. Pharyngeal gill slits
C. A ventral hollow nerve cord
D. Heart lying dorsally
Answer:B
Which one of the following features is present in some stage of the life history of all chordates? (UP-CPMT 2000)
A. Blood flowing forward in dorsal blood vessel B. Pharyngeal gill slits C. A ventral hollow nerve cord D. Heart lying dorsally