Question: what is a sample of matter that has the same composition and properties throughout
[{'answer': 'homogeneous mixture', 'provenance': [{'wikipedia_id': '23672776', 'title': 'Homogeneous and heterogeneous mixtures', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]