Question: how many species of sea stars are there
[{'answer': 'About 1,500', 'provenance': [{'wikipedia_id': '228613', 'title': 'Starfish', 'start_paragraph_id': 1, 'start_character': 227, 'end_paragraph_id': 1, 'end_character': 238, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '228613', 'title': 'Starfish', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 428, 'bleu_score': 0.900273723668463, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5212093966347245354}, 'section': 'Section::::Abstract.'}]}]