Sentence in question :
Claims about harmful effects of the genetic alteration of vegetables are more speculation than documented fact.
Should the nouns speculation and fact be plural because they refer to the plural claims?
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1No. Grammmatically you could make a case for (optionally) using plurals there, but stylistically I'd say singular is better. I might put the indefinite article before "harmful effects" rather than "genetic", but it's all just stylistic choices. – FumbleFingers Reinstate Monica Aug 23 '14 at 17:09
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Compare Claims about the harmful effects of cellphone radiation are more speculation than documented fact. You wouldn't move the article there. – FumbleFingers Reinstate Monica Aug 23 '14 at 17:14
