Question: when did the first insects appear on earth
[{'answer': 'about 480 million years ago', 'provenance': [{'wikipedia_id': '3969819', 'title': 'Evolution of insects', 'start_paragraph_id': 1, 'start_character': 311, 'end_paragraph_id': 1, 'end_character': 338, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3969819', 'title': 'Evolution of insects', 'start_paragraph_id': 1, 'start_character': 37, 'end_paragraph_id': 1, 'end_character': 1184, 'bleu_score': 0.8750298939547411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8084369638764900982}, 'section': 'Section::::Abstract.'}]}]