Certain parts of the brain govern specific functions. For example, the cerebellum is involved with coordination; the hippocampus with memory. Nerve cells (neurons) are the basic unit of communication in the brain.
Eukaryotic organisms use mitosis to reproduce sexually. In mitosis, the parent cell is divided into two daughter cells which be identical to the parent cell. Edit
1 Prokaryotes: Organisms whose cells lack a nucleus and therefore have DNA floating loosely in the liquid center of the cell. 2  Prokaryotes divide, and thus reproduce, by simple mitosis. 3  Eukaryotes: Organisms that have a well-defined nucleus to house and protect the DNA. 4  Eukaryotes divide by meiosis for sexual reproduction.