Examine This Diagram

Examine this diagram.Note the structure of branches connecting groups of organisms.Called a phylogenetic tree,the branches propose relationships among organisms to each other,related to common ancestors.Although the proposed relationships can be described in sentences,the diagram summarizes them visually.The phylogenetic tree,then,represents

A) a collection of emergent properties among organisms.
B) the taxonomic names of all organisms indicated at each line and branch.
C) a hypothesis that can be tested.
D) an original set of observations on similarities and differences among organisms.
E) proof of the evolutionary theory of interrelationships among organisms.