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The science of taxonomy and where humans fit into the tree of life More free lessons at: http://www.khanacademy.org/video?v=oHvLlS_Sc54

What a species is and isn't. Ligers, tiglons, mule, hinnies, and dogs More free lessons at: http://www.khanacademy.org/video?v=Tmt4zrDK3dA

Secondary active transport in the nephron. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-renal-system/rn-renal… Missed the previous lesson?

Overview of how the nephrons in the kidney filter blood and reabsorb water and other molecules. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-renal-system/rn-the-r… Missed the previous lesson?