A team of researchers has discovered a seagrass plant in the Baltic Sea that is over 1,400 years old, according to a new paper. The seaweed is the oldest plant whose age has been precisely determined, according to the international research team led by Thorsten Reusch from the Geomar Helmholtz Center for Ocean Research in Kiel in northern Germany. The seagrass primarily reproduces vegetatively, via underground offshoots. The individual parts of such a clone differ only very slightly genetically. The researchers, who come from Germany, London, and California in the United States, used this fact…