Water is often in short supply in the terrestrial environment. Some terrestrial habitats, such as deserts, intensify this challenge. Many plants that inhabit particularly dry areas have
one or more adaptations that allow them to conserve water. Plants adapted to dry environments are called xerophytes.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.