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# Some other information to know about trees.   ***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.  ## Groupings of taxa in trees  * Clade.  * Monophyly.  * Paraphyly.  ## Support for trees.  Bootstrapping.