What is the purpose of a conclusion paragraph?

In "there will come soft rains," why does the author turn the house into a mechanical creature? a. to stress how well run the future will be b. to keep readers from realizing at the start that no humans are present c. to stress how scientific advances can create the perfect society d. to compare the present with the earlier, non-mechanical times

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 )

Edgar allan poe uses many sound devices in his poem "the bells." which two words from the poem are examples of onomatopoeia?