Answer:
Adrenaline has been more important to human survival in the past because back then they didn't have the resources we have now for situations that are high-stress, dangerous and/or physically exhilarating. They also didn't have much information on the situations. For more specific information I recommend searching up what adrenaline does and what it is, how people reacted to dangerous situations in the past and compare that to how people react to dangerous situations now. You can then come up with a conclusion on your own when you have that information.