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The human body contains approximately 37.2 trillion cells, which are the basic structural and functional units of life. These cells are incredibly diverse and can be classified into three main categories based on their function and structure: prokaryotic, eukaryotic, and unicellular organisms. Prokaryotic cells lack a true nucleus and other membrane-bound organelles, while eukaryotic cells have a well-defined nucleus and various specialized organelles that perform specific functions such as photosynthesis, respiration, and protein synthesis. Unicellular organisms are composed of single cells that can reproduce and grow independently. The human body is made up of approximately 75 trillion red blood cells, which carry oxygen from the lungs to the body's tissues and carbon dioxide from the tissues back to the lungs.