How the nucleus is formed
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Answer:
The nucleus of a cell is formed from the nucleus of the cell that divided to form it. Each cell's nucleus divides into two nuclei every time the cell divides. Sometimes the old nucleus is partially disassembled and reconstructed in the process.
Some cells, such as bacteria, archaea, and red blood cells, don't have nuclei. The nuclei of red blood cells are destroyed during their creation in bone marrow, probably to make more room for the hemoglobin molecules that carry oxygen.
So the question comes up, where did the first cell nucleus come from? That is a tough question. Possibly it was originally a separate cell that was engulfed by a larger one. Some modern cell parts, such as mitochondria and choloroplasts, are thought to have originated in this way. But no one really knows exactly how the first primitive cell nuclei came to be, even though there are several interesting theories.