At some point in their lives all chordates have a flexible supporting rod in their backs called a

asked Apr 27, 2018 99.7k views

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notochord is the answer
hope it helped

Gilchris answered Apr 28, 2018

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At some point in their lives all chordates have a flexible supporting rod in their backs called a notochord.

H B answered May 3, 2018

by H B

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