Darwin wrote many of the premises of 'The Theory of Evolution by Natural Selection' by noting differences in the of closely related while studying in the Galapagos Islands?

Darwin formulated his theory of evolution by natural selection based on his observations of unique species adaptations to different environments on the Galapagos Islands. He noted variations in closely related species that indicated a process of adaptation to their specific habitats over time. This observation led him to propose that individuals better suited to their environment would be more likely to survive and reproduce, passing on their advantageous traits to future generations.