(D) The size of cells is generally very small and cannot be seen with the naked eye. Most cells range in size from $1 \ \mu m$ to $100 \ \mu m$. There

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(D) The size of cells is generally very small and cannot be seen with the naked eye. Most cells range in size from $1 \ \mu m$ to $100 \ \mu m$. Therefore,the most appropriate and standard unit used to express the size of cells in biology is the micrometer $(\mu m)$,where $1 \ \mu m = 10^{-6} \ m$.