What Is Life?

Abstract

Life on Earth originated from a single replicating molecule, or a system of molecules, which initiated the evolutionary process. Self-replication, driven by chemical properties and environmental building blocks, led to the emergence of diverse life forms. Copying errors during replication occasionally produced advantageous variations, like enhanced stability or replication rates, which, through natural selection, became prevalent in subsequent generations. Evolution’s cumulative nature allowed later generations to inherit and build upon these adaptations, resulting in the complex organisms observed today. Early life developed mechanisms like movement for nutrient acquisition and protective membranes for stability. The distinction between life and non-life is ultimately arbitrary, as there is a continuous spectrum from basic chemical processes to complex biological systems. Defining “life” is a semantic exercise, and stipulating specific criteria doesn’t necessarily provide new biological insight. While evolution explains life’s diversification, abiogenesis, the initial formation of a replicator from non-living matter, remains an open question. The improbability of abiogenesis on any given planet is mitigated by the anthropic principle, which states that observers can only arise in universes where life has emerged. – AI-generated abstract.