Assertion (A): All living organisms are composed of cells and products of cells. Reason (R): All cells arise from pre-existing cells. class 9 chapter 5 science
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All living organisms are made up of tiny structure cell. cells are also known as building block of human body every organisms are made up of cells B. Yeah all cells divide and reborn as the cell and these cells first form as organ, next as organ system and finally as humanbeings
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