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:
Liabilities
Financial obligations or debts that a company owes to others, which must be paid back.
Cumulative Preferred Stock
Cumulative Preferred Stock is a type of preferred shares that have a provision entitling shareholders to receive dividends that were missed in the past before any dividends are paid to common shareholders.
Fully Participating
Refers to a type of preferred stock or other securities that entitle holders to receive additional dividends beyond a specified amount if certain conditions are met.
Stock Dividend
A stock dividend is a dividend payment made in the form of additional shares rather than a cash payout, increasing the number of shares owned while diluting the value of each share.
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