Identify the prepositional phrase in with its rattle, a rattlesnake warns those around that they should watch where they are stepping.

warns those around that they should watch where they are stepping


Phrases are group of words that doesn't have a complete thought unlike clauses that can stand alone since it has a subject and predicate whereas a phrase doesn't.
An adjective phrase is one type of phrase to describe a noun or pronoun subject in a sentence. Also is adverb clause.