Cephalochordates are ..........

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(D) Cephalochordates (e.g.,$Branchiostoma$ or $Amphioxus$) exhibit the following characteristics:$1$. They are exclusively marine organisms.$2$. They

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All of the above

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(D) Cephalochordates (e.g.,$Branchiostoma$ or $Amphioxus$) exhibit the following characteristics:$1$. They are exclusively marine organisms.$2$. They retain all three primary chordate characteristics (notochord,dorsal hollow nerve cord,and pharyngeal gill slits) throughout their entire life cycle.$3$. They are ciliary feeders,meaning they use cilia to create water currents to bring food particles into their pharynx.Therefore,all the given statements are correct.

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