Bella developed a phobia of clowns after she experienced a scary thunderstorm in a room with clown wallpaper as a child. in bella's case the clown wallpaper served as:

Answer is unconditioned stimulus.

In classical conditioning which is learning process the term unconditioned stimulus or in short UCS is used when unconditionally and without a person’s control a response is initiated. For example if someone likes roasted chicken, the smell will automatically trigger hunger.

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.

answer; acquired mainly during early childhood;