Biology 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0-07802-426-9
ISBN 13: 978-0-07802-426-9

Chapter 39 - Locomotion and Support Systems - Engage - Page 749: 1

Answer

Hydrostatic skeletons are the most primitive type of skeletons. They are composed of fluid-filled cavities that provide limited structure and form. Annelids and hydras have hydrostatic structures, as well as mammals such as elephants.

Work Step by Step

Hydrostatic skeletons are the most primitive type of skeletons. They are composed of fluid-filled cavities that provide limited structure and form. Annelids and hydras have hydrostatic structures, as well as mammals such as elephants.
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