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Learn about saturated, unsaturated, and trans fats in this Khan Academy video.
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Learn about natural, cyclical, structural, and frictional unemployment rates with Khan Academy's comprehensive video tutorial.
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Learn about cell parts and their functions in this comprehensive guide.
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Kinetic energy is the energy an object possesses due to its motion. Learn about its definition, formula, and examples on Khan Academy.
What are Mastery Challenges? – Khan Academy Help Center
2024年9月20日 · Mastery Challenges are a way for you to review and practice skills you’ve previously learned in a course. It's also another way for you to earn mastery levels, in addition to taking Unit Tests and Course Challenges.