What type of phrase is story in the school paper caused changes study hall procedures?

The phrase "story in the school paper caused changes in study hall procedures" is a noun phrase functioning as the subject of the sentence.

Here's why:

* Noun Phrase: It's a group of words centered around a noun ("story") that acts as a single unit.

* Subject: It tells us who or what is performing the action of the verb ("caused").

Let's break down the noun phrase:

* Head Noun: "story"

* Modifiers: "in the school paper," "caused changes in study hall procedures"

These modifiers add information about the story, describing its location and effect.