Question: when does human embryo implant to the wall of the uterus
[{'answer': 'between 6 and 12 days'}, {'provenance': [{'wikipedia_id': '7357937', 'title': 'Implantation (human embryo)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 150, 'bleu_score': 0.5421505875750391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7040628148897721144}, 'section': 'Section::::Abstract.'}]}]