In the process of evolution by natural selection illustrated in the accompanying figure,which of the following is the mechanism or agent of natural selection? 
Definitions:
Millimeter
A metric unit of length equal to one thousandth of a meter.
Line Of Best Fit
The line of best fit, in statistics, is a straight line drawn through the center of a group of data points on a scatter plot, used to describe the relationship between variables and predict future data points.
Data Points
Individual pieces of factual information recorded and used for the purpose of analysis.
Scientific Method
A systematic process used for investigation, including observation, hypothesis formulation, experimentation, and conclusion.
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