Phylogenetic tree illustrating evolutionary relationships among vertebrate groups.

A phylogenetic tree diagram showing the evolutionary relationships among various animal groups, including sharks, ray-finned fish, amphibians, primates, rodents & rabbits, crocodiles, and birds, with labeled traits such as vertebrae, bony skeleton, four limbs, amniotic egg, eggs with shells, and hair. The tree includes instructions for identifying ancestral groups, marking the MRCA of amphibians and ray-finned fish, and determining relatedness based on the tree structure.