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5. Cells are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells .
6.Cells have different shapes because they do different things . . . . Animal cells come in many different shapes and sizes . The shapes of cells have evolved to help them carry out their specific function in the body , so looking at a cell ' s shape can give clues about what it does .
DIVYANSH MARK AS BRAINLIAST
Answer: a cell is known as a structural unit of life because it has a
definite structure and a defence mechanism built within itself like cell membrane and many other cell organelles . the second reason is that the definite shape and volume of the cell.
a cell is known as the functional unit of life because even a single cell can perform various functions which a whole body does ;like excreation,respiration,digestion,circulationand many more.
Explanation:
the shape of the cell depends upon the function ,tension,location and pressure of the cell.whereas the cell varies in sizes because different cells have different capability of controling the surface area to volume ratio.