What are the sequence of events in the evolution of species

Founding population arrives, biogeographic isolation occurs, genetic changes

Anatomy. Species may share similar physical features because the feature was present in a common ancestor.

Molecular biology. DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are.

Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.

Fossils.

Direct observation.