The appositive in the sentence is an expert on wildlife.
The appositive is nonessential.
The appositive is an adjectival phrase.
The purpose of the appositive is to give more information about my father.
It should be noted that an appositive simply means a noun or noun phrase which renames the noun that's next to it. It adds another information about the noun.
It should be noted that the appositive in the sentence is an expert on wildlife. It gives more information about the father. The appositive is nonessential and it's is an adjectival phrase.
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