Question: what part of the fish is used to propel the fish through the water
[{'answer': 'their fins', 'provenance': [{'wikipedia_id': '22210655', 'title': 'Aquatic locomotion', 'start_paragraph_id': 26, 'start_character': 86, 'end_paragraph_id': 26, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::Fish.\n'}]}, {'answer': 'their bodies', 'provenance': [{'wikipedia_id': '22210655', 'title': 'Aquatic locomotion', 'start_paragraph_id': 26, 'start_character': 58, 'end_paragraph_id': 26, 'end_character': 70, 'bleu_score': 1.0, 'section': 'Section::::Fish.\n'}]}, {'provenance': [{'wikipedia_id': '22210655', 'title': 'Aquatic locomotion', 'start_paragraph_id': 26, 'start_character': 0, 'end_paragraph_id': 26, 'end_character': 918, 'bleu_score': 0.9864398934896761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12353281326503699841}, 'section': 'Section::::Fish.\n'}]}]