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.
Answer: the Alps and the Apennines,
Two mountain ranges, the Alps and the Apennines, helped to protect Rome from invasion. The Apennines divide the Italian peninsula in half and, according to SPQR Online, allowed the Romans to mass forces for counter-attack whenever they were threatened.
Answer: B. Increased human capital increases productivity.
Explanation:
More educated women in developing countries means that they can get better opportunities like a high-skill job or start a business. Options A) and C) are true but not directly related to the question.
Lincoln Steffens, Jane Addams, Upton Sinclair, Ida Tarbell, Jacob Riis,
