new cells can be made for three reasons
To replace damage tissue.
To replace old cells
to use for growth
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The process that produces haploid sex cells is mitosis.
Cells use the process of glycolysis in order to survive. Glycolysis is the process by which a cell creates a chemical known as ATP in order to breathe oxygen and create glucose.
Dead cell means a cell that has expired. Normally cells "die" through the process apoptosis within a prescribed time. Red blood cells expire after 120 days. For each kind of cell the period varies. These dead cells will be replaced with new cells eventually.
All living organisms are made of cells, or the littlist units of life. There are many different types of cells. (red blood cells, white blood cells)
By the process of respiration. In this process, glucose is oxidised to carbon dioxide and water (aerobic) and ATP is produced. (ATP is the energy currency of cells)