Answer
Curling up into a ball exposes less skin area to the environment, which helps retain body heat. Calculus can be used to show that a sphere has minimal surface area for the volume it encloses.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 12 - Think and Explain - Page 242-243: 71
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