Given the question: Fact 1: Threatening behavior causes a fight-or-flight response in animals. Fact 2: If a pony feels threatened it can respond with aggressive behavior. Given the two facts above, answer the question "What sort of behavior can cause fight-or-flight responses?" with the following options: - hyperthyroidism - aggressive - hormones - humans - bullfrogs - hypothyroidism - similar - some mammals
The answer is:
aggressive