Answer: The audience for the essay Sojourner is every person that is interested in poetry-like and reflective essays. The purpose is to raise awareness of our roll on this planet, and how we are "the sojourners" in it. Annie Dillard uses metaphors such as comparing mangroves to humans, to convey the message.
Explanation: Annie Dillard speaks to a very general public, her audience is every person that would like to reflect on who we are for the world, and her purpose is to raise awareness on people through metaphors and allegories. She compares, for instance, mangroves to humans, saying that we are "the sojourners" on our planet, being nomads and not belonging anywhere, but she also refers to the planet itself as a sojourner.
Possibly to emphasize it, or to mark it as being sarcastic. You choose.
The middle of the sentence or after it states what's happing in the story your reading
