In an analysis of DNA sequence evolution in a single gene in multiple vertebrate species, a researcher divides the data into two classes: differences among species at the first and second positions in codons, and differences among species at the third positions in codons. When the researcher plots the results, below, she finds that she has two different molecular clocks. Explain the researcher's findings. 
Definitions:
Loss On Redemption
The financial loss incurred when a debt instrument, such as a bond, is repaid before its maturity date.
Effective-Interest Method
A method of calculating the amortized cost of a bond and the amount of interest expense over its relevant period.
Amortization
The process of spreading out the cost of an intangible asset over its useful life or the repayment of loan principal over time.
Interest Expense
The cost incurred by an entity for borrowed funds over a period, reflected in its income statement.
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