How the process of natural selection could account for the speciation that Darwin observes on Galapogos island?

Natural selection explains speciation on the Galápagos Islands through adaptation to diverse environments. As finch populations spread across the islands, they faced different ecological pressures, such as varying food sources and climates. Those individuals with traits favorable for survival and reproduction in their specific environments thrived, leading to gradual changes over generations. This process ultimately resulted in the emergence of distinct species adapted to their unique habitats.