What kinds of evidence do evolutionary biologists use to test hypotheses about how different species are related to each other. Earth & Marine Sciences

Evolutionary biologists consider observations of living species, DNA, and fossils. Scientists make comparisons between living species and fossils of extinct species to study shared anatomical traits. More recently, they began comparing DNA. Close relatives will share more traits, both physical and genetic, inherited from their common ancestor. So scientists can develop hypotheses for how these traits changed over time and how they evolved  between different lineages and test them with additional evidence.