Based on the figure, use phylogenetic reasoning to explain whether feathers evolved for flight, and why. What other possible advantages could feathers provide? Is there a way to determine the original selective function? Explain your answer. 
Definitions:
Significance Level
A threshold of probability set before conducting a hypothesis test, below which the null hypothesis is rejected, symbolized as alpha (α).
Standard Deviation
Standard deviation is a statistical measure that quantifies the variation or dispersion of a set of data points or values around their mean.
Test Scores
Numerical or grading assessments that evaluate a person's performance on academic or skill-based tests.
Aptitude Tests
Standardized tests designed to measure an individual's potential to succeed in a particular activity or field of study.
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