Question: where does the energy to fix gaseous co2 come from
[{'answer': 'sunlight', 'provenance': [{'wikipedia_id': '719534', 'title': 'Carbon fixation', 'start_paragraph_id': 1, 'start_character': 287, 'end_paragraph_id': 1, 'end_character': 295, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'lithoautotrophs', 'provenance': [{'wikipedia_id': '719534', 'title': 'Carbon fixation', 'start_paragraph_id': 1, 'start_character': 462, 'end_paragraph_id': 1, 'end_character': 477, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '719534', 'title': 'Carbon fixation', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 830, 'bleu_score': 0.9828310228624961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2698332140151936130}, 'section': 'Section::::Abstract.'}]}]