What biological indicator does the Phylum Chordata classification confirm for *A. ocellatus*?
Answer
Possession of a notochord at some developmental stage
Placing the Pacific wolf eel into the Phylum Chordata confirms a foundational characteristic shared by all members of this group, including all vertebrates. This characteristic is the presence of a notochord at some point during the organism's development, which provides skeletal support. This places it above the Kingdom level classification (*Animalia*), which only indicates it is multicellular and heterotrophic, and distinguishes it from invertebrates lacking this defining embryonic structure.
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