Phytogeny (Gr, Phylon = tribe or race; geneia = origin) is the origin and diversification of any taxon or the evolutionary history of its origin and diversification. It is usually represented as a diagrammatic phylogenetic tree (that traces putative evolutionary relationships), i.e., dendrogram. Palaeontology is the study of fossils. Ontogeny is the whole course of an individuals development and life history.