Based on careful inspection of the genetic code, why might the second position of a codon have the lowest rate of substitutions in a gene? 
Definitions:
American Capitalism
An economic system in the United States based on private ownership of the means of production and the creation of goods or services for profit.
Spheres of Influence
Areas in which one country or organization has significant cultural, economic, military, or political influence over another.
American Trading Interests
The economic motivations and activities involving the exchange of goods and services between the United States and other countries.
Self-Determination
The principle that a community or nation has the right to determine its own political status and pursue its economic, social, and cultural development independently.
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