A) Ventral spinal chord
B) Dorsal heart
C) Pharyngeal gill slits
D) Blood flow in forward direction in ventral blood vessels
Correct Answer: C
Solution :
Chordate animals, at some time in their life history, exhibit the following three diagnostic characters: (1) Presence of notochord. (2) Presence of dorsal tubular nerve cord. (3) Presence of gill clefts during development. Beside these, some other characters are: (4) Ventral heart. (5) Hepatic portal system.
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