So, you can read a tree diagram like a picture story of evolutionary history. The trunk of the tree is the ancestral line, made up of generation after generation of the same type of organisms.

Plant Ecology, Vol. 194, No. 1 (Jan., 2008), pp. 5-16 (12 pages) Disturbances and environmental heterogeneity are two factors thought to influence plant species diversity, but their effects are still ...

Giacomo Sellan, Jill Thompson, Noreen Majalap, Francis Q. Brearley, Soil characteristics influence species composition and forest structure differentially among tree size classes in a Bornean heath ...