Answer:
1. Anatomy. Species may share similar physical features because the feature was present in a common ancestor.
2. Molecular biology. DNA reflects the shared ancestry of life. DNA comparisons can show how related the species are.
3. Biogeography. The global distribution of organisms reflect evolution and geological change.
4. Fossils. Fossils prove the existence of now extinct past species that are related to present day species.
5. Direct observation. We can directly observe evolution in organisms with short life cycles