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Since I have specified where the change happened - the ecosystem, should I use article "the" here? Also, should I put "the" before ecosystem?

The extinction of endangered animals results in the dramatic changes in ecosystems and in the food chain

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The first article is unnecessary, since "changes" is plural, but is needed in the singular "food chain". If one is picky, it might be better to use parallel construction and have them both plural: if there are isolated ecosystems, then there would be multiple food chains. In that case, no article is needed there, either.

  • u mean when the noun after preposition of is plural, we do not need to use definite article for the noun in front of? – Goodie Good Aug 13 at 4:31
  • Actually, it should have referenced "changes"... that is being corrected. Sorry. – DrMoishe Pippik Aug 13 at 17:35
  • Outside of a more compelling context, I don't think the definite article at the beginning of the sentence is needed either. What do you think? – userr2684291 Aug 13 at 21:21
  • Agreed, the initial "The" is optional. – DrMoishe Pippik Aug 13 at 21:47
  • so normally, if we talk about general concept, we would use either the +singular noun or plural nouns only? – Goodie Good Aug 14 at 0:55

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