I don’t speak Spanish sorry
The railroad system was important for imports and exports out west. Another main reason is for the transportation.
I hope this helps! :)
The correct answer is a neutral stimulus.
A neutral stimulus (such as a bell, or an object), that is repeatedly followed by unconditioned stimulus, eventually elicits a conditioned response. For instance, in Ivan Pavlov's famous classical conditioning study, he repeatedly paired a neutral stimulus (a ringing bell) that came before an unconditioned stimulus (food), and eventually the sound of the bell alone elicited a conditioned response (salivating) in dogs.
