Part of a much larger 'the way things work' site, Anatomy focuses on the role of "skeletons — and why we have them." The section entitled "The Science" provides a look at joints, tissues, and other aspects of biology and bio-mechanics. There is also an interactive skeleton which will amuse your students as they make its various parts jump. But the site offers much in the way of solid learning opportunities.
Royal Institute of Great Britain
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• High School Middle School Elementary School