question: What do birds use to fly?
choices.text: Muscles in the chest neurotransmitters very small or liquid particles Beaks and feet Sound and luck a lot of energy sensory nerve cells Water and sky
choices.label: A B C D E F G H
formatted_question: What do birds use to fly? (A) Muscles in the chest (B) neurotransmitters (C) very small or liquid particles (D) Beaks and feet (E) Sound and luck (F) a lot of energy (G) sensory nerve cells (H) Water and sky