Question: where does gas exchange take place in the gills
[{'answer': 'surface area', 'provenance': [{'wikipedia_id': '37926134', 'title': 'Fish gill', 'start_paragraph_id': 1, 'start_character': 502, 'end_paragraph_id': 1, 'end_character': 514, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37926134', 'title': 'Fish gill', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 1136, 'bleu_score': 0.9903144846642211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14379447179473830048}, 'section': 'Section::::Breathing with gills.\n'}]}]