What is the flexible rod that supports a chordate's back?

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Multiple Choice

What is the flexible rod that supports a chordate's back?

Explanation:
Notochord provides axial support as a flexible rod along the length of a chordate, running just above the gut and below the nerve cord. This structure lets the body bend and flex while maintaining a stable axis. In most vertebrates, the notochord is later replaced by the vertebral column, which becomes the rigid backbone that protects the spinal cord. The spinal cord itself is the nerve tissue that runs inside that column, not the supporting rod. So the flexible rod that supports a chordate's back is the notochord.

Notochord provides axial support as a flexible rod along the length of a chordate, running just above the gut and below the nerve cord. This structure lets the body bend and flex while maintaining a stable axis. In most vertebrates, the notochord is later replaced by the vertebral column, which becomes the rigid backbone that protects the spinal cord. The spinal cord itself is the nerve tissue that runs inside that column, not the supporting rod. So the flexible rod that supports a chordate's back is the notochord.

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