PS1.A: Structure & Properties of Matter
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Atoms, Isotopes, and Ions
$10.82 – $75.71Model the sub-atomic particles in atoms, isotopes, and ions.
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Brittle Bones: A Density Problem
$17.30 – $140.60How does low bone density increase the risk for bone fractures?
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Enzymes and Lactose Intolerance
$15.14 – $105.99How do enzymes help people with lactose intolerance?
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