Put these units in order from smallest to , meter, kilometer, millimeter, centimeter, nanometer, micrometer

Nanometer, micrometer, millimeter,centimeter, decimeter, meter and kilometer.

Explanation:

The units used to measure the distance are used in the form of meters. The meters has different exchangeable units like centimeter, millimeter, etc. The S.I. unit of distance is meter.

Nanometer has meters,  Micrometers has meters, millimeter has  meters, centimeter has  meters, decimeters has  meters, meter and kilometer has  meters.

Thus, the increasing order is nanometer, micrometer, millimeter,centimeter, decimeter, meter and kilometer.

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explanation: