Molecular evolution is a field of biological study that focuses on the genetic changes that occur within and between species over time. Researchers in this field use molecular biology techniques to study the DNA, RNA, and protein sequences of different organisms to understand how they have evolved and diverged from common ancestors. By comparing genetic sequences, researchers can infer evolutionary relationships, track the origins of genes and traits, and investigate the mechanisms driving evolutionary change. Molecular evolution provides valuable insights into the history of life on Earth and the processes that drive genetic diversity and adaptation in organisms.