29 Animal Behavior 838
How do animals interact with one another and their environments?
29.1 Elements of Behavior 840
29.2 Animals in Their Environments 847
Elephant Caller ID?
Unit 7 Project 858
UNIT 8 The Human Body 859–1034
30 Digestive and Excretory Systems 860
How are the materials that go into your body and the materials that come from your body related to homeostasis?
30.1 Organization of the Human Body 862
30.2 Food and Nutrition 868
30.3 The Digestive System 875
30.4 The Excretory System 882
The Telltale Sample
31 Nervous System 894
How does the structure of the nervous system allow it to control functions in every part of the body?
31.1 The Neuron 896
31.2 The Central Nervous System 901
31.3 The Peripheral Nervous System 906
31.4 The Senses 909
Poisoning on the High Seas