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https://www.khanacademy.org/test-prep/mcat/social-sciences-practice/social-science-practice-tut/e/navigating-the-stages-of-sleep Hi, I am doing some practice from Khan Academy for Psychology and Sociology, Can someone explain to me how this figure has 4 sleep cycles? Thank you!
Passage title: Synthesis of anti-tumor drug Combretastatin and its derivatives Passage Section: CHEMICAL AND PHYSICAL FOUNDATIONS OF BIOLOGICAL SYSTEMS PASSAGES Hello everyone, I still do not understand the purpose of HCl in the question. Can somebody explain to me the mechanism behind why HCl is used or which standard reaction in follows from the prep books? Thank you so much! Synthesis of anti-tumor drug Combretastatin and its derivatives _ Chemical and physical sciences practice passage questions _ Chemical and Physical Foundations of Biological Systems Passages _ MCAT _ Khan Academy.pdf
https://www.khanacademy.org/test-prep/mcat/physical-sciences-practice/physical-sciences-practice-tut/e/the-effect-of-contrast-agents-on-mri-signalsHi, I was wondering if anyone can explain how they got this answer. I replaced omega with 20 but could not get the right answer still. Thank you so much!