Mechanisms of Evolution: https://bioprinciples.biosci.gatech.edu/module-1-evolution/mechanisms-of-evolution/#:~:text=There%20are%20four%20key%20mechanisms,natural%20selection%2C%20and%20gene%20flow.
Macroevolution (major evolutionary changes) happens over millions of years. Microevolution can happen even during a couple generations (due to mutations happening every generation. Science is amazing!) Macroevolution: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5661017/ Origin of Life (keep in mind scientists are still undergoing semi-heavy research, but they have a lot of it down): https://news.uchicago.edu/explainer/origin-life-earth-explained
