Example: certain spiders have evolved to produce web fibres that have an aqueous coating, supplied and maintained by hygroscopic compounds to attract the required water molecules from the atmosphere.
Yes, it evolved. Many polyanions and polycations - DNA, for one - are hygroscopic. Take a silk fiber and change a few amino acids to give them a charge and you've made it more hygroscopic. Point mutation followed by natural selection = evolution. Or co-extrude one of any number of hygroscopic carbohydrate polymers, which arachnids make in quantity.
How did the spider find these hygroscopic compounds and incorporate them into the production line? It evolved.
The spider found nothing. The spiders that expressed a gene that made their webs attract water survived better. One wonders why anyone has difficulty with the idea.
That explanation is all-sufficient. The precise acidity control? It evolved. The hyperbolic extrusion die? It evolved. The exact recipe of proteins, sugars, phosphates, calcium, sulfur, neurotransmitter peptides and other organic and inorganic ingredients that yielded a substance humans cannot emulate? It evolved. The ability to control the solidification and folding at exactly the right time and place? It evolved. The ability to sort out tough silks and soft, flexible sticky silks into a radial pattern? It evolved. The skill to snare insects, detect their presence, and get to them without getting stuck itself? It evolved.
Why does he have a problem with any of this?
It evolved because it evolved: that is apparently enough intellectual content to satisfy a brainwashed Darwinist.
On the contrary, all of these processes were characerized by people who had enough intellectual curiosity to go discover and study them, then to have their curiosity denied by some jerk with time on his hands and a penchant for multicolored fonts. And what's his beef? Because in contrast with the complexity of the mechanisms themselves, biology has a comparatively simple explanation for their ontology - evolution. It's not that he dislikes the simplicity per se, either; he prefers another equally simple but far less useful explanation - Godidit.
Just one of the limited number of standard Creationist arguments. Compile a lengthy litany of biological facts - chances are, all of them discovered by Darwinian biologists - and then point to them and ask, how could something that complex have evolved? Argumentum ad ignorantem.