If the egg cell has a diameter of 121 micrometers, then its diameter in millimeters is equal to 0.0121.
One thousand (1,000) micrometers (µm) are equal to 1 millimeter (mm), thereby 121 micrometers can be considered equal to 0.0121 millimeters.
In conclusion, if the egg cell has a diameter of 121 micrometers, then its diameter in millimeters is equal to 0.0121.
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