Question

select the appositive or appositive phrase.

while falling asleep, some people experience hypnic jerks, involuntary twitches of the body. experts say theyre normal, but the cause is unknown.

Explanation:

An appositive or appositive phrase renames or explains a noun. In the sentence, "involuntary twitches of the body" renames "hypnic jerks", so it is the appositive phrase.

Answer:

involuntary twitches of the body