Cell Structure
Every living organism is made up of cells. There are two different kinds of cells - Prokaryotic cells are simpler and do not have a nucleus (also called the "control center" of the cell) or other organelles (a sub-"organ" within the cell body that has a special function). Eukaryotic cells are larger and much more complicated, with many organelles that each have their own job to do within the cell.
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Plant cell structure |
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A diagram of an animal cell in three dimensions |
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Human red blood cells |