Question: where do cells come from according to the cell theory
[{'answer': 'pre-existing cells', 'provenance': [{'wikipedia_id': '102858', 'title': 'Cell theory', 'start_paragraph_id': 1, 'start_character': 231, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '102858', 'title': 'Cell theory', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1069, 'bleu_score': 0.9730644290195721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 572929153081556065}, 'section': 'Section::::Abstract.'}]}]