Which one of the following groups of organisms has significance in diagnosing the death by drowing

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Q: 4 (RAS/2011)

Which one of the following groups of organisms has significance in diagnosing the death by drowing

question_subject: 

Science

question_exam: 

RAS

stats: 

0,72,154,69,24,61,72

keywords: 

{'lichens': [0, 0, 0, 3], 'cyanobacteria': [1, 0, 1, 2], 'organisms': [4, 1, 3, 2], 'diatoms': [0, 1, 0, 0], 'protozoa': [1, 0, 0, 0], 'death': [5, 3, 6, 7]}