Final answer:
Charles Darwin proposed the Theory of Evolution through Natural Selection. He brought this theory to the forefront of scientific thought through his research, particularly his work 'On the Origin of Species'. His extensive evidence and careful observations made his theory widely accepted.
Step-by-step explanation:
The 'he' referred to in your question is most likely Charles Darwin, renowned for his work in the field of biology. Charles Darwin proposed the Theory of Evolution through Natural Selection. According to this theory, organisms with traits advantageous for survival in their environment would more likely survive and pass their traits to the next generation. Over time, this leads to changes in species and the evolution of new ones.
Darwin brought his theory of evolution to the forefront of scientific thought through his detailed and thorough research, most notably expressed in his seminal work, On the Origin of Species, published in 1859. His extensive empirical evidence gathered from trips such as the one to the Galapagos Islands and years of meticulous observation made his findings hard to deny, setting off a profound shift in scientific thought.
Learn more about Theory of Evolution