Catalytic closure as defining trait of living organisms
According to Stuart Kauffman, quoted in Bray, Wetware (2009),
Life, at its root, […] lies in the property of catalytic closure among a collection of molecular species. Alone, each molecular species is dead. Jointly, once catalytic closure among them is achieved, the collective system of molecules is alive.
This is in line with Schrödinger’s definition of life in “What is Life” as well.
TODO: Expand the "What is Life" connection.