Here's why:
* Nouns name people, places, things, or ideas. "Life" refers to the state of being alive.
* Adverbs describe verbs, adjectives, or other adverbs, answering questions like "how," "when," "where," or "to what extent."
* Adjectives describe nouns, answering questions like "what kind," "which one," or "how many."
Let me know if you'd like examples of how "life" can be used in a sentence!