0.001 grams is equivalent to which of the following?

The correct answer is milligram, as 0.001 grams directly equates to 1 milligram. This relationship is based on the metric system, where one gram is defined as being equal to 1,000 milligrams. Therefore, to convert grams to milligrams, you multiply the number of grams by 1,000.

In this context, 0.001 grams can be calculated as follows:

0.001 grams x 1,000 milligrams/gram = 1 milligram.

Thus, 0.001 grams is precisely one milligram.

The other options reference different metric units that have distinct conversions to grams. A centigram is 0.01 grams, a decigram is 0.1 grams, and a microgram is 0.000001 grams. These conversions highlight why milligram is the correct answer, as it is the only unit that accurately represents 0.001 grams.