Individuals are selected…. Individuals survive or don’t survive…. Populations evolve!. Individuals DON’T evolve…. Populations Evolve!. Natural selection acts on individuals differential survival “survival of the fittest” differential reproductive success who bears more offspring
Body size & egg laying in water striders
Beak depth of
Medium ground finch
Mean beak depth of parents (mm)Where does variation come from?
Are we moving towards a blended world?
EC – 28; October 2010 Scientific American
Journey of Man
Eyes of Nye—Race!
5.5 myaThe Antarctic Ocean freezes over