What was Darwin's evidence in the Darwin theory?

Answer 1

Darwin collected thousands of specimens across the world. Like other naturalists before him, Darwin noted similarities in the species that contributed to their classification. But Darwin also had fossils detailing changes that had occurred over vast stretches of time.

Darwin noted pigeon breeders could introduce stable changes in a population via a process of artificial selection. He also saw that nature introduced its own changes in species. Although there is a huge diversity of life, Darwin saw how it was organized and how it must have changed over the ages. Not long after he published his theory, a fossil of Archeopteryx was discovered, showing the link between birds and dinosaurs. Later fossils of Neandertal were discovered, demonstrating the existence of multiple hominid species in prehistoric ages past.

Answer 2

Darwin's theory of evolution by natural selection was supported by evidence such as the diversity of species on the Galápagos Islands, the fossil record showing transitional forms, and observations of artificial selection in domesticated animals. He also noted the variability of traits within species and the struggle for existence due to overproduction of offspring.