Re:The challenges to Darwinism (Score 1)

irreducible complexity (in reference to a system): the inability to remove any part from the system and have the system still perform its intended task.

why irreducible complexity is not broken: biological systems can be shown to have not arisen from simpler systems in a _consistently_ advantagous(to survival) way.

Darwinian evolution: the theory that natural selection acting on random mutations has given rise to life as we know it on this planet.

Directed evolution: the theory that natural selection acting on _directed_ mutations (as well as random mutatinos that of course happen) has given rise to life as we know it.

the challenge to Darwinism: the evidence that life on this earth could not have arisen solely from natural selection acting on random mutations. Noone disputes that random mutations and natural selection occur, only that they are what solely accounted for life on this earth.

a conceptual, undetailed example of irreducible complexity, vision: required for vision, a molecule upon being hit by a photon emits an electric signal, a molecule upon receiving an electric signal creates a unique chemical signal, a transport for this chemical to surroundings, a molecule which accepts this unique chemical signal and acts upon it.

This is not the best example and does not even touch on the complexities involved in the simplest forms of visual stimulations(sensing light) that we have found in living organisms.

A billion years may pass trying but you will never be able to walk across a canyon by taking single steps.

-benjc