sentences:  Monophyletic groups are particularly worthy of attention and naming primarily because they often share properties of interest.Since many paraphyletic groups also share such properties, plesiomorphies in their case, providing them with names is also conducive to productive research.Such naming is strongly defended by some scientists; in a 2005 letter to the editors of the journal " Taxon", 150 biologists from around the world joined in defense of paraphyletic taxa.