Question: who is the scientist credited with the discovery of natural selection
[{'answer': 'Alfred Russel Wallace', 'provenance': [{'wikipedia_id': '1494', 'title': 'Alfred Russel Wallace', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1494', 'title': 'Alfred Russel Wallace', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 765, 'bleu_score': 0.928281380557443, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14659894238454850056}, 'section': 'Section::::Abstract.'}]}]