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21 points
PERIPHYTONS is validvalid
PERIPHYTON, [n]
PERIPHYTON, aquatic organisms which are attached to, or cling to, stems and leaves of rooted plants, rocks, etc. [n]
PERIPHYTON, [n]
PERIPHYTON, aquatic organisms which are attached to, or cling to, stems and leaves of rooted plants, rocks, etc. [n]