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He explained the appearance of design — without a designer.
Charles Darwin's theory of evolution by natural selection showed how variation and differential survival, repeated over time, produce intricate adaptation. It reorganized all of biology around common descent. Charles Darwin's theory of evolution by natural selection showed how variation and differential survival, repeated over time, produce intricate adaptation. It reorganized all of biology around common descent.
Charles Darwin's theory of evolution by natural selection showed how variation and differential survival, repeated over time, produce intricate adaptation. It reorganized all of biology around common descent.
Natural Selection
Variation plus differential survival, repeated over generations, designs intricate complexity with no designer, producing the appearance of purpose from a blind process. The mechanism generalizes: ideas, products, and habits evolve the same way under selection pressure. To change what persists, change what survives.
Adaptation
Organisms are not optimal but merely good enough for their environment, carrying the scars and compromises of their history. Adaptation is local and path-dependent, never ideal. Judge fitness against the actual environment, not an abstract best.
Common Descent
Every organism alive traces back to a single ancestral population, so humans, oak trees, and bacteria are literally distant relatives. Difference is a matter of branching, not separate creation. Apparent strangers can share one origin.
Sexual Selection
Traits like a peacock's tail are costly for survival yet persist because they win mates, showing reproduction rather than mere living drives evolution. Fitness is about copies left behind, not longevity. What spreads is not always what helps you last.
Fitness Landscapes
Evolution climbs toward higher fitness but can get stranded on a local peak with no uphill path to a higher one nearby. Improvement that only ever goes up can trap you below the true summit. Sometimes you must get worse to get better.