The Blind Watchmaker
Cumulative natural selection explains complex adaptation without requiring foresight or a designer selecting the final result.
Complex organisms can appear purposefully designed.
A finished adaptation can look impossibly unlikely if we imagine it appearing in one step. Dawkins changes the comparison, examining accumulated differences rather than random assembly of the final result.
Dawkins separates one improbable leap from many cumulative changes.
Variation supplies differences while selection preserves effects under particular conditions.
The process has no anticipation of a future endpoint.
Small advantages can accumulate across generations.
The process does not know what it is building. That distinction matters because an understandable outcome need not come from foresight, and a useful illustration is not the whole history of a species.
Examples and simulations illustrate the distinction from random assembly.
Classification and evolutionary history are examined through competing explanations.
Constraints affect the paths available to selection.
An illustrative simulation is not a complete reconstruction of natural history.
The central argument explains adaptation without attributing conscious intention to evolution.
The central argument explains adaptation without attributing conscious intention to evolution.
How can many small selections produce an adaptation that would be almost impossible to assemble in one leap?