Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 30, Digestive and Excretory Systems - Standardized Test Prep - Page 893: 5



Work Step by Step

Option B is incorrect. The exchange of oxygen and carbon dioxide is the function of the respiratory system. Option C is incorrect. This is a smaller function of the digestive system. Option D is incorrect. Removing waste from the blood is the function of the excretory system. Option A is correct. The digestive system breaks down large molecules of food into smaller ones that can be absorbed and used by the body.
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