question: What prevents injury by forming protective plates over the ends of the fingers?
choices.text: bone vorticella keratin protection lamphreys Cartilage skin water
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) bone (B) vorticella (C) keratin (D) protection (E) lamphreys (F) Cartilage (G) skin (H) water