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<a accesskey="3" href="page.php?w=Biotic_index&amp;p=2">3.Next</a>
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<p>A <b>biotic index</b> is a scale for showing the quality of an <a href="page.php?w=natural_environment">environment</a> by indicating the types and abundances of <a href="page.php?w=organism">organism</a>s present in a representative sample of the environment. It is often used to assess the <a href="page.php?w=water_quality">quality of water</a> in marine and freshwater ecosystems. Numerous biotic indices have been created to account for the <a href="page.php?w=Bioindicator">indicator species</a> found in each region of study. The concept of</p><p>
<a accesskey="3" href="page.php?w=Biotic_index&amp;p=2">3.Next</a>
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