question: What forming over the ends of fingers prevents injury?
choices.text: tissue keratin hairs needles shells bone Cartilage tiny hairs
choices.label: A B C D E F G H
fact2: Fingernails are also made of keratin.
combinedfact: Keratin forming over the ends of fingers prevents injury
formatted_question: What forming over the ends of fingers prevents injury? (A) tissue (B) keratin (C) hairs (D) needles (E) shells (F) bone (G) Cartilage (H) tiny hairs