When measuring the length of an earthworm, which graduations allow for the most accurate measurement?
Biology · Middle School · Wed Jan 13 2021
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When measuring the length of an earthworm, using a ruler or measuring tape with the smallest graduations (i.e., the smallest marked divisions) allows for the most accurate measurement. Typically, a ruler with millimeter (mm) graduations is ideal for such a measurement since it provides a higher resolution than a ruler with centimeter (cm) graduations. The millimeter is a smaller unit, and thus you can get a more precise measurement of the earthworm's length. Measuring in millimeters allows you to record even the slightest differences in length that you might miss if using larger units (like centimeters or inches).