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NASA
Nasa: The Space Place: What's in the Heart of a Comet?
NASA site explores what a comet's nucleus is composed of. Animation and photographs are provided as well.
Georgia Department of Education
Ga Virtual Learning: Anatomy and Physiology: Cardiopulmonary Sys Transportation
Through informational text along with printable notes, animations, video clips, and practice problems, students discover how the structures of the cardiovascular and respiratory systems work together and function as one. Provides lots of...