Question: which type of survivorship curve describes populations whose mortality is highest at young ages
[{'answer': 'Type III or concave curves', 'provenance': [{'wikipedia_id': '16612525', 'title': 'Survivorship curve', 'start_paragraph_id': 5, 'start_character': 13, 'end_paragraph_id': 5, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '16612525', 'title': 'Survivorship curve', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 550, 'bleu_score': 0.9766041382465441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10416169161698480884}, 'section': 'Section::::Abstract.'}]}]