How do scientists diagram evolutionary relationships? Scientists represent evolutionary relationships with tree diagrams (also called cladograms) because new life forms appear the way new branches ...

Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama. Trees are among the earth's most useful and beautiful products of nature.

Phylogenies are a fundamental tool for organizing our knowledge of the biological diversity we observe on our planet. But how exactly do we understand and use these devices? Tree diagrams have been ...