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.

the correct answer on edgen is:

(c.) prevent the spread of communism.

i just took the test.