Respuesta :
Hey .
External Stimuli :External stimuli is a stimuli that causes a response from outside . E.g when it is cold , you keep yourself warm by putting a jacket .
Internal Stimuli : Causes a response from inside . For example, when you eat a pizza, the urge to eat a pizza was triggered from inside. Either it was hunger or just your wish to go for pizza not a burger that was an internal stimuli.
For more understanding see the picture below .
Hope it help!

Answer:
External stimuli is a stimuli that causes a response from outside . E.g when it is cold , you keep yourself warm by putting a jacket .
Internal Stimuli : Causes a response from inside . For example, when you eat a pizza, the urge to eat a pizza was triggered from inside. Either it was hunger or just your wish to go for pizza not a burger that was an internal stimuli.