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Sentence I is incorrect-"Lethal" is an adjective meaning "deadly" or "causing death." The sentence uses it incorrectly as a noun ("the lethal of cold river water"). This is grammatically incorrect. Sentence II is correct- "Lethal" is appropriately used to describe the cyanide capsules as deadly. Sentence III is correct-"Lethal" is correctly used to indicate that the hydrocyanic acid is deadly to all living tissues.
8.5 can be expressed in terms of percentage as:
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