Answer:
Because the end of each verse of the poem reveals the opposite of what human beings think about themselves.
Step-by-step explanation:
The irony in a poem is established when the poem exposes the opposite of what is thought of in reality.
We can confirm that the end of each verse of the poem shown above is ironic, because it shows how insignificant the human being is, since if the earth were destroyed, no one would care since this planet and its inhabitants are not relevant to anyone but themselves . In addition, the poem shows that we would all be destroyed, showing that all living beings are equal, the insect, the king, the rich, the poor, the worm, the cockroach and so on.
However, we human beings believe that we are relevant to the universe, just as we think that there is a hierarchy that places human beings above other beings.