You can say either: "aucun n'a répondu" or "personne n'a répondu". They mean about the same thing with a slight difference in connotation:"aucun" seems to imply a known group of people of which nobody replied. "personne" is simply "nobody".
Comparing it to English, it seems to me that "aucun" is similar to "none" and "personne" to "nobody".
-- Chris (not a native speaker).
Bonjour Helen !
To complete Chris's answer, here is a link to our related lessons:
Bonne journée !
I believe that Aucun in the plural can be used with those nouns that only exist in a plural form and also for those nouns whose meanings differ from singular to plural.
e.g.Aucuns agrès (No equipment), Aucunes arrhes (No deposit); Aucuns frais (No charges).
D'aucuns (Some (people)) acting as an equivalent of Certains or Quelques-uns is sometimes used:
D'aucuns croient que la terre est plate.
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