Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 44, Problem 2TYK
Summary Introduction

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In animals, the circulatory system helps in the distribution of nutrients and oxygen from the external environment into the body. In return, it expels waste products and carbon dioxide from the body to the external environment. The circulatory system varies from simple animals to complex animals.

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In the evolution of circulatory systems, how is a two-circuit circulatory system (such as that found in frogs) advantageous compared to a single-circuit circulatory system (such as that found in fishes)?
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Explain why single circulatory system characteristics were not retained in terrestrial animals
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