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What change must have occurred during the evolution from invertebrate chordates to vertebrate chordates

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Answer:

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. an endoskeleton evolved to enclose the spinal cord, which develops from the notochord.

Explanation:

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