Which sentence includes a nonrestrictive clause?

Camels, which sway from side to side as they walk, are often called ships of the desert.
For centuries, camels have been used to transport people and cargo through the desert.
Not only do they need very little water, but camels can drink water that is salty or bitter.
Camels can live in extreme conditions, such as in areas with extreme heat, aridity, and a lack of vegetation.

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.

its hard for me to see which word is supposed to be in bold. if i knew then i would be able to better.

question:   read the sentence. a few of the committee members did not attend. which of the following accurately labels the bolded words? predicate nominative complete predicate simple predicate predicate adjective?

answer: complete predicate

hope this . c;