question: What is required for guiding?
choices.text: Muscles in the upper arm. frequency tuning A hinged joint coordination functions Knowing direction. sensory nerve cells calcium and protein Stomata closing
choices.label: A B C D E F G H
formatted_question: What is required for guiding? (A) Muscles in the upper arm. (B) frequency tuning (C) A hinged joint (D) coordination functions (E) Knowing direction. (F) sensory nerve cells (G) calcium and protein (H) Stomata closing