The gnathostomes were the first vertebrates to:

Name: The gnathostomes were the first vertebrates to:
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Gnathostomes are characterized by possessing jaws, which allowed them to greatly expand their feeding habits and dominate aquatic and terrestrial ecosystems. They evolved around 440 million years ago during the Silurian period. While they also have scales and some species have gills or feathers, it was the development of jaws that distinguishes them from the earlier jawless fish known as agnathans.

The Gnathostomes Were the First Vertebrates To