“Besides the large number of nested structures in bone, a common feature of all of them is a slight curvature, providing twisted geometry. To name a few, the mineral crystals are curved, the protein strands (collagen) are braided, the mineralized collagen fibrils twist, and the entire bones themselves have a twist, such as those seen in the curving shape of a rib for example.”
This does not look like the work of the blind watchmaker that our old friend Richard Dawkins used to be so fond of.
University of York. 2018. Revealing the remarkable nanostructure of human bone. Science Daily. (3 May).