Question: diapsids dominated the terrestrial landscape for the first time following which event
[{'answer': 'the Cambrian explosion', 'provenance': [{'wikipedia_id': '23234', 'title': 'Paleozoic', 'start_paragraph_id': 2, 'start_character': 190, 'end_paragraph_id': 2, 'end_character': 212, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23234', 'title': 'Paleozoic', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 755, 'bleu_score': 0.9265332904532361, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8099357458137877593}, 'section': 'Section::::Abstract.'}]}]