Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 25 - Self-Quiz - Page 433: 8

Answer

a. lampreys

Work Step by Step

Jawless fishes called the ostracoderms evolved about 480 million years ago. Most of them were small and became extinct following the rise of the jawed fishes. Only two groups of jawless fishes descended from the ostracoderms remain today: the lampreys and the hagfishes.
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