The evolution of the notochord in chordates permitted a more complex embryonic development.

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The rigid "scaffold" of the notochord became the internal foundation for a skeleton. This then allowed for complex muscle development. Some organisms have cartilaginous skeletons while most are made of bone. Information can be found in the section Construction of Complex Chordate Bodies Begins on a Stiffening Scaffold.

The Evolution of the Notochord in Chordates Permitted a More