At the March 17th seminar , I presented my research. It was mainly an analysis of the phylogenetic position of orphan organisms (organisms whose phylogenetic position is unknown) based on large-scale sequence data, and in addition, I showed that huge lineages (Archaeplastida), including plants, are monophyletic. Although monophyly of Archaeplastida has been debated for many years, this study clarified that they are monophyletic and why they were not monophyletic in previous research. The seminar was very active, with many questions about the methods of phylogenetic analysis and biological questions.