Gish's theorem

Gish's theorem, often discussed in debates about evolution and creationism, asserts that the complexity of biological structures makes them unlikely to have arisen by chance alone. It suggests that if a system has many interdependent parts, all must exist simultaneously for the system to function, making gradual evolution improbable. Gish used this idea to argue for intelligent design. However, many scientists point out that systems can evolve through simpler forms and that natural processes, like evolution by natural selection, can lead to complex structures over time, countering the argument of improbability.