BIOLOGY: CONCEPTS AND INVEST. ACCESS
BIOLOGY: CONCEPTS AND INVEST. ACCESS
5th Edition
ISBN: 9781264448678
Author: Hoefnagels
Publisher: MCG
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Chapter 31, Problem 2WIO
Summary Introduction

To explain:

The reasons for efficient respiratory and circulatory systems evolved as animals’ energy demands increased.

Concept introduction:

The major function of the respiratory system is to supply oxygen for cellular respiration and disposal of the carbon dioxide that is a waste product of the cellular respiration. The circulatory system is responsible for bringing oxygen, nutrients, and hormones to the cells of the body.

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