Final answer:
The final two lines of the poem 'Grass' allude to the restorative power of nature over remnants of human conflict, suggesting that with time, nature heals the battlefields, metaphorically speaking to the inevitability of life continuing despite death and destruction.
Step-by-step explanation:
The final two lines of the poem "Grass" by Carl Sandburg remind the reader that nature has restorative power over the scars of human conflict. "I am the grass. Let me work." suggests that nature will eventually cover the battlefields, and in doing so, allows for a type of healing over the violence and death that occurred there. This regeneration acts as a metaphor, indicating that despite the devastating effects of war, life continues, and the natural world has the final word in the healing process. Therefore, the best answer is that the final two lines remind the reader that Nature will have the last word, death comes to everyone, and we will turn to dust and return to the earth as compost from which fresh green grass springs.