Question: what is the function of pharyngeal pouches in aquatic chordates
[{'answer': 'filter - feeding', 'provenance': [{'wikipedia_id': '1892628', 'title': 'Pharyngeal slit', 'start_paragraph_id': 1, 'start_character': 21, 'end_paragraph_id': 1, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'respiration of aquatic chordates', 'provenance': [{'wikipedia_id': '1892628', 'title': 'Pharyngeal slit', 'start_paragraph_id': 1, 'start_character': 414, 'end_paragraph_id': 1, 'end_character': 446, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1892628', 'title': 'Pharyngeal slit', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1361, 'bleu_score': 0.9252547584751931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2975221392537380191}, 'section': 'Section::::Abstract.'}]}]