Chordates represent a diverse group of animals united by several key characteristics that define their evolutionary lineage. Five hallmarks shared by all chordates include:
1. Notochord: The notochord is a flexible, rod-like structure that runs along the length of the body, providing support and acting as a flexible axis for muscle attachment. It also serves as a developmental ______ ______ _______ _____ ___ ___ __________ ____ _______.
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