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Question

In vertebrates, the notochord is

A
Persists throughout life
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B
Is partially replaced by vertebral column
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C
Is completely replaced by vertebral column
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D
Is partially or wholly replaced by vertebral column
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Solution

The correct option is D Is partially or wholly replaced by vertebral column
Notochord is a flexible rod-like structure of mesodermal cells that is the principal longitudinal structural element of chordates and of the early embryo of the vertebrates, in both of which it plays an organizational role in the nervous system development. In later vertebrate development, it becomes part of the vertebral column.

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