How do all different types of cells work together to perform functions in the body?

The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.

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the cells resulted from meiosis (gametes)  are haploid because they contain half the number of chromosomes found in somatic cells