Adaptations for aquatic life

term ocean survival is that of the coelacanth. Fossils of this armored fish dating back more than 75 million years have been discovered, and it was thought to have been extinct. In 1938, however, one was caught off the coast of South Africa. Since then, more than 100 of these prehistoric, deep-dwelling fish have been examined. They have no scales or eyelids, as do "modern" fish, and have quietly kept to themselves in the deepest areas of the ocean.

The hippopotamus (Hippopotamus amphibius) has its nostrils on the top of its snout allowing it to spend most of its time in the water. (Photo by Alan Root/Okapia/Photo Researchers, Inc. Reproduced by permission.)

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Essentials of Human Physiology

Essentials of Human Physiology

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.

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