Answer and explanation:
Apositives and apositive phrases are nouns or pronouns that describe further the other noun or a pronoun in a sentence, they help us to have a wider view of something.
1. Niagara Falls, the natural wonder in New York, is not the tallest in the country.
Apositive phrase: the natural wonder in New York
The noun it identifies: Niagara Falls
2. Harvard, the oldest university in the United States, is in Massachusetts.
Apositive phrase: the oldest university in the United States
The noun it identifies: Harvard
3. My brother Jim lives in Kansas.
Apositive phrase: my brother
The noun it identifies: Jim
4. Diane Feinstein, a mayor of San Francisco, was the first woman mayor of that city.
Apositive phrase: a mayor of San Francisco
The noun it identifies: Diane Feinstein
5. The Sears Tower, one of the tallest buildings in the world, is in Chicago.
Apositive phrase: one of the tallest buildings in the world
The noun it identifies: The Sears Tower
6. Scott's cousin Liz sells antique cars.
Apositive phrase: Scott's cousin
The noun it identifies: Liz
7. Leontyne Price, the opera singer, was born in Mississippi.
Apositive phrase: the opera singer
The noun it identifies: Leontyne Price
8. The Pilgrim's ship, the Mayflower, had a stormy voyage.
Apositive phrase: The Pilgrim's ship
The noun it identifies: the Mayflower
9. Tom's dog Jasmine likes to swim.
Apositive phrase: Tom's dog
The noun it identifies: Jasmine
10. Dr.Miller, our family physician, is attending a convention with her husband
Apositive phrase: our family physician
The noun it identifies: Dr. Miller