Which one of these are the most convenient unit for measuring cells?

A) millimeter
B) micrometer
C) nanometer
D) picometer
E) centimeter

Micrometer

A unit of length in the metric system equal to one millionth of a meter, also used as a device for precise measurements of small distances.

Nanometer

A unit of length in the metric system, equal to one billionth of a meter, often used to measure wavelengths of light and dimensions of molecules.

Picometer

A unit of length in the metric system, equal to one trillionth of a meter, used to measure extremely small distances.