linkedin post 2020-08-16 05:20:02

RUDIMENTARY NOSE. “The first vertebrates were jawless fish named agnathans who are classified in the phylum Chordata and subphylum Vertebrata and whose fossil ancestors can be traced back to the Cambrian period around 500 million years ago. Living agnathans display a primitive or rudimentary olfactory organ.”

http://www.wjgnet.com/esps/DownLoadFile.aspx?Type=Digital&SubType=2&DOI=10.5319%2Fwjo.v6.i2.33&FilePath=Pub%5C10.5319%5Cv6%5Ci2%5CWJO-6-33.doc

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