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10 cards from this deck
Better-adapted organisms more likely survive & reproduce
Multiple genes that control one characteristic
Selection favoring one extreme of population distribution
Observable physical & biochemical traits
Shifts population mean towards favored extreme
Selection favoring average, selecting against extremes
Taller & narrower curve, same mean, reduced variation
Arctic fox: shorter ears, thicker fur
Kangaroo rat: concentrated urine for water conservation
Swallow: seasonal migration to avoid food shortage
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