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Untamed Science
Untamed Science: Biology: Human Biology: Respiratory System
Make learning about the human respiratory system fun and easy. Explore how this system gets oxygen into the body for gas exchange.
Massachusetts Institute of Technology
Mit: Open Course Ware: Courses: Biology: Introductory Biology
College-level introductory biology course focusing on the application of the fundamental principles of human biology. Course topics include genetics, cell biology, molecular biology, disease (infectious agents, inherited diseases and...
BiologyWise
Biology Wise: Digestive System of a Frog
Describes the anatomy of a frog's digestive system and how the stages in the process of digestion. A comparison is made with the human digestive system.