Notochord is:

Endodermally derived structure, formed on the dorso ventral side

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Ectodermally derived structure, formed on the dorsal side

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Mesodermally derived structure, formed on the dorsal side

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Mesodermally derived structure, formed on the ventral side

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Solution

The correct option is C Mesodermally derived structure, formed on the dorsal side
Notochord is a mesodermally derived rod-like structure formed on the dorsal side during the embryonic development in some animals.
Animals with notochord are called chordates and those animals which do not form this structure are called non-chordates, e.g., Porifera to Echinodermata.

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