The statement that is true about a ruler marked in millimeters compared to a ruler only marked in centimeters is:
It can make more precise measurements.
This is because a millimeter ruler has smaller units (1 mm = 0.1 cm), allowing for finer resolution and thereby enabling more precise measurements. However, the other statements are not necessarily true in a general context. For instance:
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It can make longer measurements: Both rulers can measure the same maximum length, depending on the length of the ruler.
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Its measurements can have more significant figures: This depends on the actual measurement being taken rather than just the unit of measurement.
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It can make more accurate measurements: Accuracy relates to how close a measurement is to the true value, which can depend on factors other than just the type of ruler.
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It can make exact measurements: This is relative to the measurement itself; both types of rulers can only be as exact as the physical limitations and user capability.
In summary, a millimeter ruler allows for greater precision in measurements compared to a centimeter-only ruler.
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