The post discusses how life persists and evolves in environments with minimal to no light. It highlights the adaptive nature of organisms to fill ecological niches after mass extinction events, with an emphasis on the evolutionary biology perspective. User comments suggest conducting experiments to determine the exact thresholds of light intensity for photosynthesis in algae, raising questions on the application of empirical research to understanding life in extreme conditions. The significance of the Last Universal Common Ancestor (LUCA) in the context of life's evolution is also noted, linking back to the resilience and adaptability of early life forms.