On this page: 1  Symptoms of glandular fever. 2  Cause of glandular fever. 3  Diagnosis of glandular fever. 4  Treatment for glandular fever. 5  Where to get help. 6  Things to remember.
A phylogenetic tree, also called and evolutionary tree, is a tree showing the evolutionary relationships among various biological species or other entities that are believed to have a common ancestor of the descendants, and the edge lengths in some tree correspond to time estimates.
However, it is not easy to construct phylogenetic trees and there is often controversy among systematists (a phylogenetic tree is a hypothesis on how a group of organisms might be related). Some organisms that appeared closely related in some respects, may seem more distantly related in other respects.