While others had proposed ideas of evolution before Darwin, he was the first to present a compelling and well-supported theory based on:
* Natural Selection: The idea that individuals with traits better suited to their environment are more likely to survive and reproduce, passing those advantageous traits to their offspring.
* Variation: Individuals within a population exhibit natural variations in their traits.
* Heritability: These variations are, at least in part, heritable, meaning they can be passed from parents to offspring.
Darwin's theory revolutionized our understanding of life and the diversity of species. It's important to note that he was not the first to propose evolution, but his contribution was in providing a robust mechanism - natural selection - to explain how it occurs.