Question

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?
centimeters
decimeters
meters
millimeters

Explanation:

Step1: Analyze earthworm length

Earthworms are typically a few centimeters to decimeters long, but for precise measurement, smaller units are better.

Step2: Compare unit sizes

• Meters: Too large (1m = 100cm), not suitable for earthworm length.
• Decimeters: 1dm = 10cm, still relatively large for precise earthworm measurement.
• Centimeters: Commonly used for small lengths, but millimeters are smaller.
• Millimeters: Smallest unit here, allows more precise measurement of small lengths like earthworms (since earthworms can be a few cm, mm gives finer gradations).

Answer:

millimeters