A notochord is present at some time in the life cycle of all chordates.

Name: A notochord is present at some time in the life cycle of all chordates.
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The notochord is a defining feature of the chordate phylum, and while it may not persist throughout the entire life cycle of all chordates, it is present at some point in their development. It is usually an early developmental structure in embryonic stages and eventually gets replaced by the vertebral column in most vertebrates.

A Notochord Is Present at Some Time in the Life