Question: stromatolites found in western australia are are produced by which organism
[{'answer': 'cyanobacteria', 'provenance': [{'wikipedia_id': '62694', 'title': 'Stromatolite', 'start_paragraph_id': 1, 'start_character': 236, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '62694', 'title': 'Stromatolite', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 569, 'bleu_score': 0.746570809166702, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15490925752588643472}, 'section': 'Section::::Abstract.'}]}]