Not sure what would be the question here. Isthmian Central America contains all the countries mentioned: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama.
But the southernmost portion of the North American continent, which connects with South America on the southeast it is called the Isthmus of Panama. Also known as the Isthmus of Darien, the Panama isthmus is a narrow strip of land between the Caribbean Sea and the Pacific Ocean, linking North America and South America. It contains the country of Panama and is a place of strategic value.
I believe the answer is: The presence or absence of music
independent variable refers to the type of variables that are not influenced by other variables. This represent the things that can be controlled by the researchers in order to ignite a certain causal relationship with the dependent variables ( the things they want to measure)
The term that social psychologists use for the process of making people in and out group where they are made being responsible for the problems of people in the in group is scapegoat. It is a person that is being blamed for the mistakes that is done by others.