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One reason is that cells are so small,is because they are to small to be seen by the naked eye.
There are trillions of cells in the body so, they have to be extremely small to fit.
Well, there small because God wated that to be!
They're not true cells, they're not "alive" ... they are only bags of chemicals.
There is not a way to count the cells on a aquatic plant. The cells on a aquatic plant are so small.