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It is structural and functional unit of living beings
it includes all the activities of cells
it is there in each and every life process
Cell is called the Fundamental Unit of Life Because all basic metabolism activity starts from the cell.Inside the cell, energy is produced , food is stored and many more activities goes on... 
That's y it is called the " Fundamental Unit Of Life "
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The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms. Cells are the smallest unit of life that can replicate independently, and are often called the "building blocks of life". The study of cells is called cell biology.

Cells consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids. Organisms can be classified as unicellular (consisting of a single