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A rod of tough, flexible material that runs the length of a creature's body, providing the majority of its support.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia
A rod of tough, flexible material that runs the length of a creature's body, providing the majority of its support.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia
Educational Ministries, Inc. 1998</ref>
Educational Ministries, Inc. 1998</ref> Presence of a notochord at some point in developedment is one of the primary attributes of the phylum [[chordata]].