Question: where does oxygen in earth atmosphere come from
[{'answer': 'photosynthesis', 'provenance': [{'wikipedia_id': '22303', 'title': 'Oxygen', 'start_paragraph_id': 2, 'start_character': 430, 'end_paragraph_id': 2, 'end_character': 444, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22303', 'title': 'Oxygen', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 944, 'bleu_score': 0.844238069916695, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14862323539363201069}, 'section': 'Section::::Abstract.'}]}]