Alan always turns on the aquarium light before putting fish food into the tank. after a while, he notices that the fish swim to the top to look for the food as soon as he turns on the light. in this example, the is the unconditioned stimulus.

The food is the unconditioned stimulus

Explanation:

Fish need to eat to survive. The unconditioned stimulus is the food being put into the tank because it triggers a response in the fish to make them go towards the top of the tank to reach the food.

it´s related to his charming character.

beauty is not everything, although we can joke that girls only care about the physical or material aspect, the truth is that a real woman looks at more important things, besides intelligence and personality, there are other attitudes that make irresistible to men who are 'unattractive'.

for example develop your sense of humor.