question: What is essential for development of nerve cells?
choices.text: vibration steel Extensive bone growth One can hear stress melanin content sound vibrations differentiation
choices.label: A B C D E F G H
fact2: Nerve cells are large, complicated, highly specialized cells.
combinedfact: Differentiation is essential to nerve cell development
formatted_question: What is essential for development of nerve cells? (A) vibration (B) steel (C) Extensive bone growth (D) One can hear (E) stress (F) melanin content (G) sound vibrations (H) differentiation