Final answer:
The modern concept of evolution differs from Darwin's explanation in the inclusion of additional mechanisms such as genetic drift and gene flow, incorporation of knowledge of genetics, and support from empirical evidence.
Step-by-step explanation:
The modern concept of evolution differs from Darwin's explanation in a few key ways. Darwin's explanation focused on natural selection as the main driving force behind evolution, while modern concepts of evolution include additional mechanisms such as genetic drift and gene flow. Additionally, Darwin did not have a complete understanding of genetics, whereas the modern concept of evolution incorporates knowledge of genetics and the role it plays in evolution. Finally, Darwin's explanation was limited by the evidence and technology available at the time, while modern concepts of evolution are supported by a wealth of empirical evidence from various fields of science.