The part of speech that's represented by am is a verb.
The part of speech is used in the identification of how a word functions in a sentence. There are different parts of speech such as noun, pronoun, verb, adjective, conjunction, preposition, adverb, and interjection.
A verb is used in the description of an action. Examples of a verb include walk, eat, am, go, sleep, answer destroy, etc.
Based on the information given, am, answer and is represent a verb. He represents a pronoun. A pronoun is used to represent a noun.