They provide links between the ideas in different sections. It tells you what you are reading !
Here is an example of a eulogy for a dying river:
Let us remember that all things come to an end even the most beautiful and useful of things, like this river. You were once the most beautiful and useful of things to both living and nonliving things. You provided the fish a place to grow and live and the plants the water to survive. You helped form the clouds and cool the forest. But now it's over, you flow no more but our tears do. You may be dying but you will live through the animals and plants you've helped and the rain you've provided.
Answer:
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