Question

select the correct answer from the drop-down menu.

the fox turned quickly when it heard the choose an answer the sound of another animal.

options in drop-down:
crackle, apparently
crackle. apparently

Explanation:

Analyze sentence structure

The sentence is: "The fox turned quickly when it heard the [Choose an answer] the sound of another animal."
We need to fill in the blank with the correct punctuation and capitalization for the transition.
The options are:

1. "crackle, apparently"
2. "crackle. Apparently"

Evaluate grammatical flow

Let's test the first option:
"The fox turned quickly when it heard the crackle, apparently the sound of another animal."
Here, "apparently the sound of another animal" acts as an appositive phrase modifying "crackle." The comma correctly separates the noun "crackle" from its modifying appositive phrase. This forms a single, grammatically complete, and coherent sentence.

Evaluate alternative option

Let's test the second option:
"The fox turned quickly when it heard the crackle. Apparently the sound of another animal."
If we split this into two sentences, the second part "Apparently the sound of another animal" lacks a verb. This makes it a sentence fragment, which is grammatically incorrect.

Apply mastered concepts

Using the Transition Words knowledge point, we identify that "apparently" functions here as an adverb introducing an explanatory parenthetical or appositive phrase. To avoid a sentence fragment, it must be connected to the main clause with a comma rather than separated by a period.

Answer:

Select the correct answer from the drop-down menu.

The fox turned quickly when it heard the <blank>crackle, apparently</blank> the sound of another animal.