Sea urchins and sand dollars

Phylum Echinodermata Class Echinoidea Number of families 46

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Ubiquitous, spine-covered animals that often live beneath the sand surface or hide out in rocky crevices and sea grass beds

Photo: Red sea urchin (Strongylocentrotus francis-canus) (┬ęShedd Aquarium Photo by Patrice Ceisel. Reproduced by permission.)

Phylum Echinodermata Class Echinoidea Number of families 46

Thumbnail description

Ubiquitous, spine-covered animals that often live beneath the sand surface or hide out in rocky crevices and sea grass beds

Photo: Red sea urchin (Strongylocentrotus francis-canus) (┬ęShedd Aquarium Photo by Patrice Ceisel. Reproduced by permission.)

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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