General term for a scientist that researches life forms. Since 99,99 % of all Union citizens and the Fauna and flora of their homeworld are alien on all other Union planets, the Term Biologist is no longer used and the word Xenobiologist or Exo Biologist is much more common. Kids have Xeno Class in Union School where they learn about life forms of other worlds.
Of course it is not what scientists call themselves. They are much more detailed such as: Botanist, Zoologist etc, etc.