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* ***Branch rotation***. Each node in a tree can be rotated/spun around without changing the meaning of the tree. This is known as “branch rotation”.  * ***Clade***. A group of organisms consisting of a single node and all the descendants of that node in a tree and nothing else.  * ***Monophyletic group***. A clade.   * ***Common ancestor***  * ***Bootstrapping***. A statistical method used to measure how much a particular part of a phylogenetic tree is supported by all the data being used.   * ***Ingroup***. The group of taxa being studied.  * ***Outgroup***. A taxon that separated in an evolutionary tree prior to the existence of the common ancestor of the ingroup.