When did charles Darwin theorize evolution?

Answer 1

Charles Darwin sailed on the HMS Beagle in the 1820's. The classical story is that his experience of the animals and plants of South America and the Galapagos (such as iguanas, tortoises and finches) suggested to him that species were not as fixed as many had assumed. Upon his return to England, he collated and gathered much evidence for change of living organisms (across time), eventually publishing his ideas in 1859 in his famous work On the Origin of Species. Organismal change had been hypothesised before Darwin even set out on the HMS Beagle. However it was Darwin who gathered the evidence that first showed change was indisputable and that Evolution was indeed a worthy hypothesis after all. Darwin's great addition were the suggestions of the mechanisms of Natural Selection and Sexual Selection in evolution.

Answer 2

Charles Darwin published his theory of evolution in 1859 in his book "On the Origin of Species". His theory proposed that species evolve over time through natural selection, a concept that revolutionized the understanding of the development of life on Earth.