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The human body is made up of billions of cells that work together to keep us alive and functioning properly. These cells are constantly dividing and reproducing, replacing old or damaged cells with new ones. This process is called mitosis. During mitosis, the DNA in each cell is copied and divided evenly between two identical daughter cells. The genetic material from both parents is combined and passed on to their offspring. This ensures that every person has a unique set of genes that make them who they are. Cells also have different structures and functions within the body. Some cells, such as muscle cells, are responsible for movement and contraction. Others, like nerve cells, transmit messages between different parts of the brain. Even skin cells help protect us from the environment by forming a barrier around our bodies. Overall, human cells play a crucial role in maintaining life and keeping our bodies healthy.