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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Sign up to join this communitySentence 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?
Your plurals would be grammatically correct, but there is nothing wrong with the sentence as such. As FumbleFingers mentioned, its just style!