Final answer:
In the poem 'O Captain! My Captain!' by Walt Whitman, he addresses the three stages of loss through symbolism and metaphor.
Step-by-step explanation:
In the poem 'O Captain! My Captain!' by Walt Whitman, he addresses the three stages of loss through symbolism and metaphor. The three stages of loss referred to in the poem are the fear and uncertainty during the trip, the relief and joy upon reaching the destination, and the grief and sadness upon realizing that the captain has died. Whitman uses the ship's journey as a metaphor for the journey of life and the captain's death as a metaphor for the loss of a great leader like Abraham Lincoln.