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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.

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  • u mean when the noun after preposition of is plural, we do not need to use definite article for the noun in front of? Commented Aug 13, 2019 at 4:31
  • Actually, it should have referenced "changes"... that is being corrected. Sorry. Commented Aug 13, 2019 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?
    – user3395
    Commented Aug 13, 2019 at 21:21
  • Agreed, the initial "The" is optional. Commented Aug 13, 2019 at 21:47
  • so normally, if we talk about general concept, we would use either the +singular noun or plural nouns only? Commented Aug 14, 2019 at 0:55

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