Answer:
Thirst, Fear
Step-by-step explanation:
One of the key differences between many drive states is the extent to which they are triggered by internal stimuli, such as the thirst drive state, versus external stimuli, such as the fear drive state.
Thirst is an internal stimuli while fear is an internal stimuli. The drive theory is an attempt to classify physiological drives such as thirst, hunger and fear and how they control the behaviour or response of an individual.