- Competition may cause animals to fight / to make threatening sounds / to act aggressively towards members of their own species
- If two animals have the same food source then those two animals compete for food
- So, competition for food may cause animals to display threatening behavior towards each other

- Competition for food may cause animals to display threatening behavior towards each other
- Threatening behavior causes a fight-or-flight response in animals
- So, competition for food may cause a fight-or-flight response in animals

So, competition for food may cause a fight-or-flight response in animals
Q: Which factor will prompt an animal's fight-or-flight response?
Context:
- Competition may cause animals to fight / to make threatening sounds / to act aggressively towards members of their own species 
- Threatening behavior causes a fight-or-flight response in animals 
- If two animals have the same food source then those two animals compete for food