Origins of Life

Origins of life is the problem of how self-replicating, metabolizing, evolving systems arose from non-living chemistry on the early Earth. It is not merely a historical question but a theoretical one: what is the minimal set of conditions under which matter becomes organized into entities that evolve by natural selection?

The problem decomposes into three coupled sub-problems: the origin of compartmentalization (to keep replicator products local), the origin of template replication (to preserve information across generations), and the origin of metabolism (to supply the energy and building blocks required for the other two). No one of these can function without the others, which makes the origins-of-life problem a classic case of emergent organization rather than sequential assembly.

Several frameworks compete. The abiogenesis tradition emphasizes geochemical energy gradients and mineral surfaces as prebiotic scaffolding. The RNA World hypothesis posits that RNA molecules served simultaneously as genotype and catalyst before proteins and DNA emerged. Metabolism-first models argue that self-sustaining reaction networks preceded genetic polymers. Each framework identifies a different subsystem as the driver, but all face the same challenge: explaining how the three sub-problems became coupled.

The major evolutionary transitions framework reframes the question. The transition from molecules to cells was the first major transition — and it required exactly the same ingredients as all subsequent transitions: emergent collective benefits, conflict suppression, and heritable variation at the new level. Life began when chemistry became a complex adaptive system.