In pavlov's studies on classical conditioning, the bell was a(n) before it was paired with the food.

conditioned stimulus (CS)

Explanation:

This neutral stimulus is called the conditioned stimulus (CS): Its power to elicit behav- ior is conditioned on its association with the UCS. After several trials, the CS will produce a response called the conditioned response (CR).

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.