Read the sentence below and complete the instruction that follows. British astronomer Edmund Halley was the first to calculate a comet's orbit effectively. Identify the appositive or appositive phrase.

An appositive is a noun or noun phrase that identifies or renames another noun. In the sentence, “Edmund Halley” identifies who the British astronomer was, so it is the appositive. “A comet’s orbit” is what he calculated, not a name for the astronomer.

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