Differentiate between: Notochord and Nerve cord.

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NotochordNerve cord
$(1)$ It is a mesodermally derived rod-like structure formed on the dorsal side during embryonic development in some animals.$(1)$ It is an ectodermally derived structure,present on the dorsal or ventral side in all animals.
$(2)$ It may exist throughout life,only during embryonic stages,or may be replaced by the vertebral column.$(2)$ It remains present throughout the life of the animal.

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