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According to the cell theory, all organisms
must have cells. A cell is very complex and has many parts. One of the
main parts, the cells control center, is the nucleus. Some
cells have a nucleus, eukaryote, while some do not,
prokaryote. The cells that do have a true nucleus have many parts.
Some cells can have a nucleolus, chromosomes, a nuclear
envelope, nuclear plasma, and nuclear pores. All of these
elements in the nucleus control all the activity in the organism.
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