Common descent, a cornerstone of evolutionary biology, refers to the shared ancestry of all living organisms, tracing back to a single universal ancestor, the Last Universal Common Ancestor (LUCA). This concept underpins the idea that species diverge from common lineages through speciation, with genetic and biochemical evidence—such as universal genetic codes and shared enzymes—supporting this unity of life.
While Darwin’s Origin of Species famously articulated this principle, literary explorations of "shared" themes, such as human experiences or societal connections, reflect similar ideas of interconnectedness. Authors like D.H. Lawrence and Alexander Michie, for instance, highlight the value of collective identity and mutual respect, echoing the biological notion of shared heritage. The synthesis of these perspectives reveals that whether in biology or literature, the theme of common descent underscores the profound interdependence of life’s diverse forms.