What is the importance of mitosis cell division to unicellular organisms?

Select the correct answer from each drop-down menu proteins are

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

This is a biological reaction due to a stimulus. i need this quickly !