Cells are the basic units of life from "summary" of The Biology Book by DK
Cells are the building blocks of life, the fundamental units from which all living organisms are composed. These microscopic structures are the smallest functional and structural units of living organisms, performing a wide range of vital functions necessary for life. From the simplest single-celled organisms to complex multicellular organisms like humans, cells are the basic structural and functional units that make life possible. Cells come in various shapes and sizes, depending on their specialized functions within an organism. Despite their differences in appearance, all cells share certain common features. Each cell is enclosed by a cell membrane that acts as a protective barrier, controlling the movement of substances in and out of the cell. Within this membrane, cells contain genetic material in the form of DNA, which carries the instructions for the cell's activities and functions. Cells are highly organized structures, with different organelles carrying out specific tasks to maintain the cell's functions. These organelles, such as the nucleus, mito...
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