Cells are the fundamental building blocks of all living organisms.Each cell is a complex, self-contained unit capable of maintaining life.Cells are the smallest structural and functional units that can perform all activities necessary for life.Each cell contains organelles like the nucleus, mitochondria, and endoplasmic reticulum that carry out specific functions.Cells vary in size, shape, and function depending on their role within the organism.For example, nerve cells have long extensions for transmitting signals, while red blood cells are disc-shaped to maximize oxygen transport.All cells are surrounded by a cell membrane that regulates what enters and exits the cell.
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