What are four key elements of the study of economics?

As such, it is a social science because it deals with the behavior of people as they deal with this basic issue. There are four key elements to this study: description, analysis, explanation, and prediction. Economics deals with the description of economic activity.

description, analysis, explanation, prediction

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.