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A '''cell''' is the basic [[structural]] and [[function]]al unit of all known living [[organisms]]. It is the smallest unit of an organism that is classified as a living [[thing]], and is often called the building block of life.[1] Some organisms, such as most bacteria, are unicellular (consist of a single cell). Other organisms, such as [[humans]], are multicellular. (Humans have an estimated 100 trillion or 10 ¹⁴ cells; a typical cell size is 10 [http://en.wikipedia.org/wiki/Micrometre µm]; a typical cell mass is 1 [http://en.wikipedia.org/wiki/Nanogram nanogram].) The largest known cell is an unfertilized ostrich egg cell.[2]

A '''cell''' is the basic [[structural]] and [[function]]al unit of all known living [[organisms]]. It is the smallest unit of an organism that is classified as a living [[thing]], and is often called the building block of life.[1] Some organisms, such as most bacteria, are unicellular (consist of a single cell). Other organisms, such as [[humans]], are multicellular. (Humans have an estimated 100 trillion or 10 ¹⁴ cells; a typical cell size is 10 [http://en.wikipedia.org/wiki/Micrometre µm]; a typical cell mass is 1 [http://en.wikipedia.org/wiki/Nanogram nanogram].) The largest known cell is an unfertilized ostrich egg cell.[2]