Which of the Following Statements About the Evolution of Notochord

Which of the following statements about the evolution of notochord development in ascidians is false?

A) The ancestral Brachyury gene exists in invertebrates.
B) Brachyury gene in ascidians has a role in notochord development.
C) In ascidians,the Brachyury T-box region encodes a transcription factor.
D) The Brachyury gene is not present in vertebrates.
E) Since invertebrates do not have notochords,the Brachyury gene must have evolved a new function.

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