Final answer:
The noun in the sentence is fox.
Step-by-step explanation:
The noun in the sentence is fox. A noun is a word that represents a person, place, thing, or idea. In this sentence, 'fox' is the noun because it represents an animal. The words 'quick,' 'brown,' 'jumped,' and 'skillfully' are not nouns; they are adjectives and adverbs that describe the noun or the verb.
Learn more about Identifying nouns in a sentence