question: What did ancestors of hagfish probably have?
choices.text: cartilage feet backbone wealth hairs keratin friends tooth enamel
choices.label: A B C D E F G H
fact2: Vertebrates are animals that have a backbone.
combinedfact: ancestors of hagfish probably had backbones
formatted_question: What did ancestors of hagfish probably have? (A) cartilage (B) feet (C) backbone (D) wealth (E) hairs (F) keratin (G) friends (H) tooth enamel