Given the question: Fact 1: Threatening behavior causes a fight-or-flight response in animals. Fact 2: All animals, including fish, are in the Animalia kingdom. Given the two facts above, answer the question "What behavior causes a fight-or-flight response in those in the Animalia kingdom?" with the following options: - some mammals - insects - bullfrogs - reproductive - nurturing - threatening - foraging - hypothyroidism
The answer is:
threatening