In this subtitle the following words have the meanings indicated. “Biodiversity” means the full range of living organisms native to a region. “Irreplaceable natural area” means an area with habitat necessary to support: A unique natural community; or A plant or animal species listed as threatened or endangered under Title 10, Subtitle 2A of this article. “Program” means the Irreplaceable Natural Areas Program. “Unique natural community” means an area that: Has an assemblage of native plants or animals that is rare or declining in the State; or Supports an unusually pristine example of a native ecosystem type.