Concept 36.1   Kidneys Regulate the Composition of the Body Fluids

Concept 36.2   Nitrogenous Wastes Need to Be Excreted

Concept 36.3   Aquatic Animals Display a Wide Diversity of Relationships to Their Environment

Concept 36.4   Dehydration is the Principal Challenge for Terrestrial Animals

Concept 36.5   Kidneys Adjust Water Excretion to Help Animals Maintain Homeostasis