question: What prevents injury by forming protective plates over the ends of the fingers.
choices.text: blood bone Cartilage lamphreys treatment keratin helmets Porifera
choices.label: A B C D E F G H
fact2: Fingernails are also made of keratin.
combinedfact: Keratin prevents injury by forming protective plates over the ends of the fingers.
formatted_question: What prevents injury by forming protective plates over the ends of the fingers. (A) blood (B) bone (C) Cartilage (D) lamphreys (E) treatment (F) keratin (G) helmets (H) Porifera