The significance of the conversation between Sierra and her friends about how their neighborhood is changing is the foreshadowing of the shapeshifters.
This refers to the literary technique that is used to show the prediction or hint about future events in a story.
Hence, we can see that although your question is incomplete, I can infer that you refer to the book Shapeshifter and the foreshadowing used shows the mayhem that is about to befall the neighborhood when dark shapes begin to move as they are possessed by spirits.
Read more about foreshadowing here:
https://brainly.com/question/96170
#SPJ1
