Celebrating Darwin's Birthday Album One  
 
Professor David Polley's favorite adaptation got the party off to a good start. His favorite adaptation: Sex. "Sex, defined as the combination of two genomes in one cell, requires cell fusion and subsequently chromosome reduction through meiosis," Professor Polley explained with a reasonably straight face. "In early eukaryotes, which were unicellular, there likely was an advantage to combine resources during periods of starvation by cell fusion. Thus sex may have originated as an adaptation to stress."  
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