This question is missing the answer options. I have found the complete question online. The options are the following:
a. The ocean, a wide expanse of salt water, is the habitat of many types of fish.
b. The ocean is the habitat of many types of fish because it is a wide expanse of salt water.
c. The ocean is a wide expanse of salt water, and many types of fish live there.
d. The ocean is the habitat of many types of fish, which enjoy the wide expanse of salt water.
Answer:
The revision which uses an appositive to combine these two sentences correctly is:
a. The ocean, a wide expanse of salt water, is the habitat of many types of fish.
Step-by-step explanation:
An appositive can be a noun or a noun phrase. It is placed beside another noun the in the sentence with the purpose of renaming it, that is, of providing further information about it. Unless restrictive, appositives appear between commas in a sentence. Take a look at the example below:
- My pet, a cat, is always asleep.
The purpose of the appositive "a cat" is to rename the noun "pet".
With that in mind, we can easily identify the option which uses an appositive to combine the two sentences:
a. The ocean, a wide expanse of salt water, is the habitat of many types of fish.
The second sentence became the appositive between the commas, "a wide expanse of salt water." Its function is to provide further information about the noun "ocean".