A) Birds
B) Fish
C) Snake
D) Amphioxus
Correct Answer: D
Solution :
Notochord is present in any stage of life of a chordate. It is replaced by vertebral column in vertebrates. Notochord is present throughout life in members of subphylum Cephalochordata, .e.g., Amphioxus. In birds, fishes and snakes, notochord is replaced by vertebral column.
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