describe the nucleus of a cell
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The nucleus is the information centre of the cell and is surrounded by a nuclear membrane in all eukaryotic . A cell normally contains only one nucleus . Under some conditions, however the nucleus divides but the cytoplasm does not .
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The heart is a muscular organ about the size of a fist, located just behind and slightly left of the breastbone. The heart pumps blood through the network of arteries and veins called the cardiovascular system.
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