Evolutionary history is the study of the processes of biological evolution and the historical relationships between different species. Researchers in this field examine how and why species have evolved over time, including the mechanisms of genetic variation, natural selection, and adaptation. By reconstructing the evolutionary history of different organisms, scientists can gain insights into the patterns and processes of evolution, as well as the relationships between different species and their common ancestors. This information can help us better understand the diversity of life on Earth and how species have adapted and changed over millions of years.