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9 October, 09:09

What did the haikouella, a primitive early chordate fossil, lack that vertebrates have?

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  1. 9 October, 11:00
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    Answer - Skull and Ear Organs

    Haikouella, a primitive early chordate fossil which is similar in appearance to to lancelet, was found to have formed-brain, eyes, and muscular segments. However it lacked two major things that vertebrates have, namely skull and ear organs. Additionally, Haikouella had respiratory gills on its pharynx.
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