Why Intelligent Design?
Some bacteria move around using whiplike structures called flagella, each one made up of dozens of complex, interconnected protein parts.
Intelligent design advocates say that, like the vertebrate eye
, the bacterial flagellum is "irreducibly complex," because the absence of any one of its many parts causes it to stop functioning. That means gradual evolution would have been unlikely.
Evolutionists Argue ...
As with the vertebrate eye, scientists have discovered several intermediate steps leading up to the bacterial flagellum, Prothero said.
"There are semi-flagella in nature that are not as complicated as the bacterial one. All of this has been documented at great length, and [intelligent design proponents] ignore it over and over again."
(Related: "Darwin Devotees Make 'Father of Evolution' Facebook Superstar."
Photograph by Jane Hurd, National Geographic Stock