Question: what is the purpose of comparing bone structures
[{'answer': 'evidence for evolution', 'provenance': [{'wikipedia_id': '265447', 'title': 'Comparative anatomy', 'start_paragraph_id': 14, 'start_character': 39, 'end_paragraph_id': 14, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Uses.\n'}]}, {'provenance': [{'wikipedia_id': '265447', 'title': 'Comparative anatomy', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 163, 'bleu_score': 0.9214109120166031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14002024426144487583}, 'section': 'Section::::Uses.\n'}]}]