what is the nucleus

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The nucleus is a specialized, usually spherical mass of protoplasm encased in a double membrane, and found in most living eukaryotic cells, directing their growth, metabolism, and reproduction, and functioning in the transmission of genic characters.

In biology, the nucleus is the control center of a cell which contains hereditary information. It holds DNA and acts as a "brain" while holding everything that the cell needs to survive inside of it.