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I didn't really understand that. But I will use the word "urchin" in a sentence. Here I go:Why is there an urchin in my bed?
What does an urchin look like?The Urchin is a spiky animal that lives in the Ocean.
The classification of a Sea Urchin is Echinoidea
No, an urchin belongs to the Animal Kingdom.
The singular possessive form is urchin's.