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Question

Notochord has been replaced in vertebrates by

A
Brain and spinal cord
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B
Cranium and vertebral column
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C
Post anal tail
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D
Both A and B
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Solution

The correct option is D Cranium and vertebral column
B. Cranium and vertebral column
EXPLANATION: Notochord is present during the embryonic development in vertebrates. It induces the development of neural tube, that gives the support for the developing embryonic body. The notochord is replaced by the vertebral column and cranium. But in protochordates the notochord remains same during the whole life or in some stage of their life.

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