Final answer:
The stress response in early humans and modern humans share similarities, such as the fight or flight response. However, modern humans are more likely to experience stress from psychological sources, which can have negative health effects.
Step-by-step explanation:
The stress response in early humans and modern humans has some similarities and differences. Both early and modern humans experience the fight or flight response in stressful situations, which involves increased heart rate and defensive/offensive behaviors. However, while the stress response in early humans was primarily triggered by physical threats, modern humans often experience stress from psychological sources. This can lead to negative health consequences, such as an increased risk of heart disease and compromised immune function.