Question: fish appeared in the fossil record during the
[{'answer': 'the Cambrian explosion', 'provenance': [{'wikipedia_id': '37824359', 'title': 'Evolution of fish', 'start_paragraph_id': 1, 'start_character': 63, 'end_paragraph_id': 1, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37824359', 'title': 'Evolution of fish', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 704, 'bleu_score': 0.9587365925518061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18021637188197624174}, 'section': 'Section::::Abstract.'}]}]