All organisms right from unicellular Amoeba to the multicellular elephant or the Giraffe are made of cells. However, these cells do not expand in size in organisms that are huge in size, instead they multiply, differentiate and take different functions, such that the organism can perform all the life processes unhindered. Since, the huge size in large organisms is attained by multiplication of cells and not increase in size, a cell if it has to be observed it has be only under a microscope.