Question: what does a bull shark tooth look like
[{'answer': 'needle - like', 'provenance': [{'wikipedia_id': '12194830', 'title': 'Shark tooth', 'start_paragraph_id': 10, 'start_character': 117, 'end_paragraph_id': 10, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Types and functions.:Needle-like teeth.\n'}]}, {'answer': 'needle - like teeth', 'provenance': [{'wikipedia_id': '12194830', 'title': 'Shark tooth', 'start_paragraph_id': 10, 'start_character': 117, 'end_paragraph_id': 10, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Types and functions.:Needle-like teeth.\n'}]}, {'provenance': [{'wikipedia_id': '12194830', 'title': 'Shark tooth', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 507, 'bleu_score': 0.9102086842696431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1467924503335351635}, 'section': 'Section::::Types and functions.:Needle-like teeth.\n'}]}, {'provenance': [{'wikipedia_id': '12194830', 'title': 'Shark tooth', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1467924503335351635}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12194830', 'title': 'Shark tooth', 'section': 'Section::::Types and functions.:Needle-like teeth.\n', 'start_paragraph_id': 10, 'end_paragraph_id': 10, 'meta': {'evidence_span': ['This was the first common style of shark tooth, present in the Devonian, four hundred million years ago. Sharks with needle-like teeth commonly feed on small to medium-sized fish, sometimes including small sharks. These teeth are especially effective for such prey because they can easily grip their slippery and narrow bodies. Modern examples include the blue shark and bull sharks. These sharks specifically use their teeth to feed on small prey like squid, flounder, stingrays, and even hammerhead sharks.\rhighlight sentence(s) containing evidence, not only the answer', 'This was the first common style of shark tooth, present in the Devonian, four hundred million years ago. Sharks with needle-like teeth commonly feed on small to medium-sized fish, sometimes including small sharks. These teeth are especially effective for such prey because they can easily grip their slippery and narrow bodies. Modern examples include the blue shark and bull sharks. These sharks specifically use their teeth to feed on small prey like squid, flounder, stingrays, and even hammerhead sharks.', 'needle-like teeth']}}]}]