How does the description of the ivy vine in paragraph 18 contribute to the tone of the passage?
t reflects Sue’s determination to keep Johnsy alive.

It shows the hopelessness of being fragile.

It shows the run-down environment where Sue and Johnsy live.

It reflects the narrator’s sense of optimism.

The ivy vine contributes to the tone of the passage by measuring her time on the earth.                                              

Explanation:

"Johnsy" lived in a hot and sunny climate of California but here the climate will affect her. This climate will not set for her. The climate will be very cool and she will be affected by pneumonia.So sue will be working hard to keep Johnsy alive. It reflects Sue's efforts to keep her alive. Sue will be worried about her health. This states the affection he has on her.