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| biotic index | |||
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| biotic index; biotic index Scale for showing the quality of an environment by indicating the types of organisms present in it (e.g. how clean a river is) | |||
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| biotic index | |||
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| biotic index; biotic index Scale for showing the quality of an environment by indicating the types of organisms present in it (e.g. how clean a river is) | |||
