Read the passage.Recently, in the waning dark hours just before dawn, the mother raccoon clambered up the side of the tree, where she proceeded to chew a hole in the trunk. The next evening, she moved into the tree with her two cubs.

The phrase “where she proceeded to chew a hole in the trunk” describes what the raccoon did after climbing the tree. Because it gives an additional action rather than identifying which tree or place, the clause is nonessential and should be set off with a comma: “tree, where she proceeded…”

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