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.
Answer: The Europeans carried a hidden enemy to the Indians. (diseases)
Explanation: The Native people of America had no immune support for the diseases that the European explorers and well as the colonist brought to them. Diseases such as smallpox, influenza, measles, and chickenpox was very deadly to American Indians.
Political trends regarding the level of government involvement in social issues are reflected by the success of conservative or liberal perspectives in political parties, in the sense of favoring greater or lesser government involvement in social issues.
The liberal perspective favors greater government regulation in the marketplace and less government involvement in personal privacy issues. Liberalism is only in favor of government intervention of private property rights and freedom.
On the other hand, from the conservative perspective, there is a favoring of lesser government protectionism in the market, private property and trade.
Regarding social issues, the conservative ideology favors the government to be less involved in decisions so that greater social and economic equality is achieved.
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fossil fuels make up the biggest percentage of air pollution
