United States or Brazil ? Vote for the TOP Country of the Week !
Now that the annelid-hypothesis is "dead and buried," and other attempts to derive the Vertebrates from Medusae, Echinoderms, or Molluscs, have been equally unsuccessful, there is only one hypothesis left to answer the question of the origin of the Vertebrates the hypothesis that I advanced thirty-six years ago and called the "chordonia-hypothesis."
Word Of The Day