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    • Pale Lichens growing on rock.
    Rights: Lara Bieleski Published 18 June 2008 Size: 130 KB Referencing Hub media

    New Zealand has over 2,000 species of lichen. How many can you see on this tree trunk? How many can you find in the school playground?

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      Bioindicators

      A bioindicator is a living organism that gives us an idea of the health of an ecosystem. Some organisms are very sensitive to pollution in their environment, so if pollutants are present, the ...

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