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An understanding of cells is therefore vital in any understanding of life itself. Cell biology is the study of cells and how they function, from the subcellular processes which keep them functioning, to the way that cells interact with other cells.
Definition of biology. 1  1 : a branch of knowledge that deals with living organisms and vital processes advances in the field of biology a biology textbook. 2  2a : the plant and animal life of a region or environment the biology of the rain forestb : the life processes especially of an organism or group the biology of cancer cells; broadly : ecology.