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Food chains and food webs explain the flow of energy through ecosystems.
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Khan Academy offers free educational resources on various topics, including biology, algebra, geometry, and more.
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Khan Academy
Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
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Here’s Why You’ll Love Our Free Study Plans. Targeted Learning: Each plan starts with a quick assessment of where you’re at.; Master the Material: Day-by-day you’ll tackle the areas that are challenging to you. Practice Makes Perfect: With ample practice and by strengthening your weakest spots, you’ll walk into your AP®︎ exam with confidence.
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Khan Academy for Teachers
39 point increase in SAT scores. Students who used Official SAT Practice for six or more hours and engaged in at least one of three recommended best practices scored 39 points more, from PSAT/NMSQT® to the first SAT, than students who did not use Official SAT Practice.
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Learn about disubstituted cyclohexane conformations in organic chemistry with Khan Academy.
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Jan 24, 2017 · Videos and video talk-throughs [producer if specified, by last name, first name.], [video name as it appears in the menu, in quotations marks], [performer if different from producer], [medium, in parentheses], [if appropriate, time in (hours):minutes: seconds at which the issue occurs followed by /][running time in (hours):minutes: seconds], [Producing organization or …
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Choose Khan Academy Districts and give teachers and leaders the tools to offer all students personalized support to learn challenging, grade-level content.