Answer
Energy is required to perform all sort of body functions including growth, movement, etc. Humans cannot make their own energy, hence they have to rely on other sources.
Work Step by Step
As above
Biology 2010 Student Edition
by Miller, Kenneth R.; Levine, Joseph S.
Published by
Prentice Hall
ISBN 10:
9780133669510
ISBN 13:
978-0-13366-951-0
Chapter 30, Digestive and Excretory Systems - 30.2 - Food and Nutrition - 30.2 Assessment - Page 873: 1a
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