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:
Help
Assistance or support offered to solve a problem or achieve a goal.
Ethical Dilemma
A question about how a person should behave that requires the person to reflect about the advantages and disadvantages of the optional choices for various stakeholders.
Older Workers
Individuals in the workforce who are typically nearing or beyond the traditional age of retirement.
Younger Workers
Individuals in the workforce who are typically younger in age, often categorized as being in their late teens to early thirties.
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