Amphioxus is certainly not the ancestor of modern vertebrates,but researchers believe it more closely resembles the earliest prevertebrate than any other living animal.

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Amphioxus, also known as the lancelet, is not the ancestor of modern vertebrates, but it is believed to closely resemble the earliest prevertebrate and is often used as a model organism in studying the evolution of vertebrates.

Amphioxus Is Certainly Not the Ancestor of Modern Vertebrates,but Researchers