A sperm cell is only a fraction of a millimeter long. Typically a human sperm is about 5 microns long. A micron is equal to one one-thousandth of a millimeter.
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300 mm
2cm and 7mm is equal to 27 mm, which is therefore less than 37mm.
100 mm
304.8 mm
23.5 millimetres is exactly 23.5 mm in length!