Notochord is used in

Attachment of muscles

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Development of dorsal nerve cord

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Formation of gill slits

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Development of kidneys

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Solution

The correct option is B Attachment of muscles
A. Attachment of muscles
EXPLANATION: Notochord is a flexible rod, which is present in chordate. It is usually closer to the dorsal than the ventral surface of the animal. Notochord is composed of cells, which are derived from the mesoderm. It is used as the site of the attachment of muscles, as a vertebral precursor and as a midline tissue, that gives the directional signals to surrounding tissue during the time of development.

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