Small,fishlike marine chordates,pointed at both ends with no distinguishable head,in which the notochord runs the entire length of the nerve cord,are called

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The description provided fits the characteristics of lancelets, which are small fish-like chordates that lack a distinguishable head and have notochord running the entire length of the nerve cord. A is incorrect because arrow worms have a distinct head and tail. B is incorrect because tunicates have a notochord only in their larval stage. C is incorrect because acorn worms have a distinct head region. E is incorrect because lampreys have a more complex body structure with distinct head and tail regions.

Small,fishlike Marine Chordates,pointed at Both Ends with No Distinguishable Head,in