As every medical student comes to learn when first dissecting the human body at medical school, our limbs are almost entirely composed of muscles.
Design with interdependent layers presents a challenge to neo-Darwinism. Natural selection is oblivious to anything but an immediate beneficial variation.
What about the charge that ID is a “curiosity killer,” tempting scientists to answer every natural mystery with a shrug and a “God did it”?
It is likely that no further improvement in muscle power can be achieved by increasing the density of packing of the myosin motors.
Remarkably, even Ernst Mayr was forced to tacitly acknowledge the challenge to Darwinism posed by convergence.