Question: what term describes features that are similar in structure but different in function
[{'answer': 'homology', 'provenance': [{'wikipedia_id': '142431', 'title': 'Homology (biology)', 'start_paragraph_id': 1, 'start_character': 12, 'end_paragraph_id': 1, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '142431', 'title': 'Homology (biology)', 'start_paragraph_id': 1, 'start_character': 3, 'end_paragraph_id': 1, 'end_character': 810, 'bleu_score': 0.88944711882157, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18038021086950768918}, 'section': 'Section::::Abstract.'}]}]