A rooted tree differs from unrooted tree by showing:
Common ancestor reflects key principle in quiz on cladogram+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Common ancestor aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Common ancestor fits helps integrate natural selection, environment.
Ref: Baum & Smith, Tree Thinking, Synapomorphy and Monophyly.