Answer:
neutral; response-producing
Explanation:
The experiments by Pavlov demonstrated how a "neutral" or also called unconditioned stimulus, was paired with a "response-producing" or conditioned response. This means that an association created between them would enable dogs to learn something unknown and new to them.
When dogs listened to a sound (a bell ringing), they learned that food was approaching to they began to salivate, for they would receive food shortly after.
After some time, dogs kept listening to a bell, but the food was no longer provided, and still, they kept salivating as if the food was there.
Therefore, they had already had a conditioned response!
Predators of frogs would need to hunt other food sources, leading to decreases in both the predators and the new prey. The prey of frog would run rampant as one of their predators are now gone.
