Anatomy Species may share similar physical features because the feature was present in a common ancestor <u><em>(homologous structures)</em></u>.
Molecular biology DNA and the genetic code reflect the shared ancestry of life.
Biogeography The global distribution of organisms and the unique features of island species reflect evolution and geological change.
Fossils Fossils document the existence of now-extinct past species that are related to present-day species.
<u><em>Direct observation</em></u> We can directly observe small-scale evolution in organisms with short lifecycles <u><em>(e.g., pesticide-resistant insects)</em></u>.
Leucine and phenylalanine have hydrophobic side chains, which means that they can interact with valine in the pocket. All other aminoacids on the list have polar (two electrically charged) side chains and cannot form hydrophobic pockets.
