Question: what ecosystem is flat with many tall grasses
[{'answer': 'Grasslands', 'provenance': [{'wikipedia_id': '198842', 'title': 'Grassland', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '198842', 'title': 'Grassland', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 541, 'bleu_score': 0.913025900208938, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8854369596747680037}, 'section': 'Section::::Abstract.'}]}]