Phylogenetic Trees Show How Species Are Related

All living species are related through common ancestors.

An illustration called a phylogenetic tree is one way to show evolutionary relationships.

A phylogenetic tree with a horizontal double ended arrow labeled More distantly related extending from branch A through C over a shorter one labeled More closely related extending from branch B to C. A blue circle at branch A is labeled Common ancestor of A, B, and C, and a red circle at branch B is labeled Common ancestor of B and C.
Understanding the phylogenetic tree