The first vertebrates to evolve lacked jaws and had skeletons made from a strong flexible tissue called cartilage.As shown in the figure below,________ are a modern example of this ancient group of vertebrates known as jawless fishes.

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Lampreys are a modern example of the ancient group of vertebrates known as jawless fishes which lacked jaws and had skeletons made from cartilage. Amphibians, reptiles, and ray-finned fishes all have jaws and have evolved from different groups of early vertebrates.

The First Vertebrates to Evolve Lacked Jaws and Had Skeletons