Type of figurative language? "my words echoed and echoed in the room"

How does the poem's mood and tone change in each of these stages of “o captain! my captain! ” by walt whitman? (i need an answer asap )

In about two hundred words, explain how the author's use of folktales and symbolism add meaning to the story and convey the central theme of the novel: the disintegration of the traditional igbo society as a result of its contact with european practices and beliefs.

From the life cycle of a plastic bottle, what is the best definition for the word “toxin”?