Campbell Biology (12th Edition)

Published by Pearson
ISBN 10: 0135188741
ISBN 13: 978-0-13518-874-3

Chapter 42 - Test Your Understanding - Levels 1-2 - Remembering/Understanding - Page 951: 4

Answer

C. Rising of CO$_2$

Work Step by Step

When you inhale the O$_2$(Oxygen) get converted into CO$_2$(Carbon Dioxide) therefore the levels of CO$_2$ rises. You then have the urge to breathe because you need to get rid of the waste that is CO$_2$ and the need for more oxygen.
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