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[[Image:OnionX100.jpg|250px|right|thumb|Onion cells - 100X magnification]]
Some organisms, such as [[bacteria]], are unicellular, consisting of a single cell. Other organisms, such as humans, are multicellular, or have many cells—an estimated 100,000,000,000,000 cells! Each cell is an amazing world unto itself: it can take in [[nutrients]], convert these nutrients into [[energy]], carry out specialized functions, and reproduce as necessary. Even more amazing is that each cell stores its own set of instructions for carrying out each of these activities.[http://www.ncbi.nlm.nih.gov/About/primer/genetics_cell.html]