Fossil evidence indicates that during the Cambrian explosion many animal phyla appear quite suddenly. Which of these phyla is NOT seen in the Cambrian explosion?

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    Chordata
    Arthropoda
    Porifera
    None of these were formed in the Cambrian explosion.
    All of these were formed in the Cambrian explosion.
asked May 19, 2013 in Biology by anonymous
    

1 Answer

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All of these were formed in the Cambrian explosion.
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)



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