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Khan Academy
Khan Academy: Biology: Chemistry of Life: Matter, Elements, and Atoms
Did you know matter is made up of atoms? In this article learn about the smallest unit of matter called the atom.
Khan Academy
Khan Academy: Passive Transport & Active Transport Across Cell Membrane Article
The cell membrane is one of the great multi-taskers of biology. It provides structure for the cell, protects cytosolic contents from the environment, and allows cells to act as specialized units. Learn how the membrane functions to...
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