Question: distinctive characteristics of animals classified as vertebrates include
[{'answer': 'backbones', 'provenance': [{'wikipedia_id': '11039790', 'title': 'Animal', 'start_paragraph_id': 44, 'start_character': 218, 'end_paragraph_id': 44, 'end_character': 227, 'bleu_score': 1.0, 'section': 'Section::::Phylogeny.:Bilaterian animals.:Protostomes and deuterostomes.\n'}]}, {'answer': 'have a vertebral column'}, {'answer': 'a vertebral column ( spine )'}, {'answer': 'have a vertebral column ( spine )'}, {'provenance': [{'wikipedia_id': '36856', 'title': 'Vertebrate', 'section': 'Section::::Abstract.', 'start_paragraph_id': 6, 'end_paragraph_id': 6, 'meta': {'evidence_span': ['Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones). Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 69,276 species described. Vertebrates include such groups as the following: Extant vertebrates range in size from the frog species "Paedophryne amauensis", at as little as , to the blue whale, at up to . Vertebrates make up less than five percent of all described animal species; the rest are invertebrates, which lack vertebral columns. The vertebrates traditionally include the hagfish, which', 'Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones). Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 69,276 species described. Vertebrates include such groups as the following: Extant vertebrates range in size from the frog species "Paedophryne amauensis", at as little as , to the blue whale, at up to . Vertebrates make up less than five percent of all described animal species; the rest are invertebrates, which lack vertebral columns.', 'Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones).']}}]}, {'provenance': [{'wikipedia_id': '36856', 'title': 'Vertebrate', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones). Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 69,276 species described. Vertebrates include such groups as the following:', 'Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones). Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 69,276 species described. Vertebrates include such groups as the following:', 'Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones']}}]}]