What feature defines the Phylum **Chordata** for *Piranga ludoviciana*?
Answer
Presence of a notochord at some developmental stage
The Phylum Chordata is a broad classification encompassing vertebrates and certain invertebrates, characterized by specific developmental structures. For organisms within this phylum, including birds like the Western Tanager, the definition rests on having, at some point during their life cycle, a notochord, which is a flexible rod providing skeletal support. Additionally, members of Chordata possess a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail, distinguishing this group from invertebrates in broader kingdoms.
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