Answer:
a conditioned stimulus
Explanation:
Ivan Pavlov was a great psychologist who has discovered the theory of classical conditioning while experimenting with dogs and has given a few important terms in the theory including conditioned and unconditioned stimulus and response.
Conditioned stimulus: According to Pavlov's experiment on classical conditioning, the term conditioned stimulus is defined as a formerly neutral stimulus after getting connected with an unconditioned stimulus gives rise to a conditioned response.
In the question above, the statement signifies that the sound of the bell is a conditioned stimulus.
D because it seams most logical
The Berlin Wall separated families and kept people from opportunity in the south
The balance of power is needed for the congress to check and balance the executive.
<h3>What is the balance of power?</h3>
The Federalist Papers No. 70 (1788) argued that the executive should be very strong so as to take actions needed to protect the nation. This means the executive branch needs power the most.
The legislative power is vested in Congress. The congress is meant to check and balance the executive.
Find out more on power at: brainly.com/question/337956
