Question: why do leaflets of mimosa fold when touched
[{'answer': 'defending themselves from harm', 'provenance': [{'wikipedia_id': '1906305', 'title': 'Mimosa pudica', 'start_paragraph_id': 1, 'start_character': 384, 'end_paragraph_id': 1, 'end_character': 414, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]