In the paper industry, for example, it is amazing how a small change in one part of a paper machine may lead to disaster elsewhere in the papermaking process. The interconnectedness and complexity of a paper machine is nothing compared to the human body. Remember, biological structures must be encodable in DNA, must be morphologically accessible in finite steps beginning with a single cell, must maintain precise chemical balances, etc., etc. I still find the evidence for design to be overwhelming - and humbling. The concept of design is especially obvious when we see similar tools, parts, and engineering solutions applied to widely varied and largely unrelated creatures.
Human engineers use a common set of tools and parts in many different settings.
The same nuts and bolts, rivets, gaskets, heat exchangers, I-beams, stainless steel alloys, copper wiring, batteries, polymer foams, composite materials, etc., etc., will be found in many diverse objects not because the objects all have a common ancestor, but because they were designed by designers having a common set of engineering solutions and materials from which to select. In nature, evolutionists try to force evolutionary relationships between creatures showing common tools and engineering solutions even when the relationships just don't make any sense. The difficulty of pathways from one organism to the other is further highlighted by recent discoveries about genome sequences which show that previously assumed, seemingly logical relationships between species are actually complex and problematic. Examination of genome data has now shown that many organisms seem to have a mix of DNA material. Some eukaryotes contain features of both bacteria and archaea, according to Russell Doolittle, a molecular biologist at the University of California, San Diego.