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The ancestors of modern-day fish were vertebrate chordates. Vertebrate chordates are believed to have evolved...

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Biology

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The ancestors of modern-day fish were vertebrate chordates. Vertebrate chordates are believed to have evolved from invertebrate chordates, which were similar to modern-day tunicates. What change must have occurred during the evolution from invertebrate chordates to vertebrate chordates? A. A backbone evolved to enclose the notochord, which develops from the spinal cord. B. An endoskeleton evolved to enclose the dorsal nerve cord, which develops from the notochord. C. A backbone evolved to enclose the spinal cord, which develops from the dorsal nerve cord. D. An endoskeleton evolved to enclose the spinal cord, which develops from the notochord.

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