Read the sentence below and complete the instruction that follows. Astronomer Maria Mitchell discovered a comet in 1847 and went on to become the first professional female astronomer in the United States. Identify the essential appositive.

An appositive is a noun or noun phrase that renames another noun. “Maria Mitchell” identifies which astronomer the sentence is about, so it is essential to the meaning and is not set off by commas. The correct choice is “Maria Mitchell.”

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