You are presented with the question "Many muscle fibers contracting at once can be induced by" and the following answer choices: - exposed genitalia - exposure to heat - sweating - exposed biceps - mechanical waves - Electrical energy - exposure to cold - Veins and arteries. Now knowing that shivering occurs when many muscles contract a little bit all at once and another response to cold is shivering, choose the best answer.
Answer:
exposure to cold