The morphological order of evolutionary trees has been the traditional argument for the
operation of directional causes in macroevolution. We show, in this work, that a similar order
can be generated within stochastic systems bounded by minimal biological constraints. Our
system generates an evolutionary tree by making random decisions about each lineage in
each time interval given preset probabilities for branching, extinction and persistence (Raup,
Gould, Schopf, and Simberloff, 1973). Morphology is determined in an independent and …