Earth: An Introduction to Physical Geology (12th Edition)

by Tarbuck, Edward J.; Lutgens, Frederick K.; Tasa, Dennis G.

Published by Pearson

ISBN 10: 0134074254

ISBN 13: 978-0-13407-425-2

Chapter 22 - Section 22.8 - Mesozoic Era: Age of the Dinosaurs - Concept Checks - Page 694: 4

Answer

Plesiosaurs and Ichthyosaurs were the reptiles that returned to life in the sea.

Work Step by Step

They breathed with the help of lungs instead of gills and learnt to swim well. They also retained their reptilian teeth.

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