Answer:camels,which sway from side to side as they walk,are often called ships of the desert
Explanation:
This answer includes a piece of information that can be removed without altering the meaning of the sentence. It could have just said camels are often called ships of the desert. The added information about the camels swaying as they walked is additional information but it isn't important to what's being said, which makes this answer a nonrestrictive clause.
