Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
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Chapter 27, Problem 4TYU
Summary Introduction

Introduction:

Gnathostomes are also known as jawed vertebrates that came into existence around 450 million years ago. They had tail and paired fins that made them highly successful predators in the aquatic habitat.

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From Sea to Changing Sea | Early Life in the Oceans || Radcliffe Institute; Author: Harvard University;https://www.youtube.com/watch?v=Ac0TmDf5Feo;License: Standard youtube license