Genesis Kinds and the Sea Urchin

The nitrogen cycle is an ecochemical pathway distributed on a global scale and including multiple organisms. Reactions comprising the nitrogen cycle are catalyzed by complex protein machines, some of which — like the nitrogen fixing system in legumes — may arguably be Irreducibly Complex (IC). The focus of this paper is not on these systems, but the overarching cycle in which they participate, asking if the cycle itself resembles an IC system, whether the components themselves are IC or not.