How caffeine can affect your stress level. how does it affect your cardiorespiratory system?

Caffeine and stress can both elevate cortisol levels. High amounts of caffeine can lead to the negative health effects associated with prolonged elevated levels of cortisol. However, small to moderate amounts of caffeine can lift your mood and give you a boost. Caffeine can raise your heart rate and cause  extra heartbeats. And using large amounts of it for long periods can increase your risk of having a heart attack.

Explanation:

Hopefully this is right.

less than one you can't create energy

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.