Extinct Creatures Fill Puzzling Gap in the Fossil Record


Research reveals yunnanozoans as the oldest known stem vertebrates. New findings answer questions in the fossil record. The puzzling gap in the fossil record that would explain the evolution of invertebrates to vertebrates has long perplexed scientists. Vertebrates share unique features, such as a backbone and a skull, and include fishes, amphibians, reptiles, birds, mammals, and humans. Inverte...

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