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Nano = billionth Milli = thousandth so clearly, a milligram is bigger.
There are 1000 picograms in a nanogram.
Pictogram is a unit of measurement much less than a milligram.
1 microgram = 1,000 nanograms 1 nanogram = 0.001 microgram The difference between 1 microgram and 1 nanogram is 999 nanograms.
A pictogram is used to compare data by pictorial images rather than lines on a graph grid