How does the poet's word choice to describe T cells contribute to the meaning of the poem

Answer: By comparing T cells to soldiers, the author stresses their importance in keeping the immune system healthy.

Explanation:

In his poem, "Immunity", Kim Roberts stresses the importance of T cells for our immune system.

He compares T cells to "sentries " that stand "at a crenellated wall." In other words, these cells protect our immune system, just like the warriors protect their defensive wall in a battle. He describes the cells as holding sheets, and he can hear their "rhythmic chant." With this word choice, the author emphasizes that, without T cells, it would be impossible to preserve immunity.