Some tools have various levels of graduations. 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?

Smaller graduations let you measure length more precisely because they show finer differences. Millimeters are smaller than centimeters, decimeters, or meters, so they allow the most accurate measurement of an earthworm. The correct choice is millimeters.

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